iOS 应用的存档数据无法正确加载
iOS app's archive data doesn't load properly
我对此很陌生，所以请多多包涵。
我使用 iOS 编程构建了一个应用程序：The Big Nerd Ranch Guide 4th ed called Homepwner 它利用归档在应用程序进入后台时存储信息并在它再次启动时加载信息，并且它工作得很好。我决定为我自己的名为 SBL 的应用程序实施相同的策略，但是当应用程序退出后加载时，数据似乎已加载但显示不正确。
该应用程序在 table 中显示了一个 "CCIEvent" 数组，它们看起来像示例：
7:00 AM：又湿又脏的尿布
8:48 AM：美联储 - 两者 - 20 分钟
上午 9:48：午睡 - 1 小时 0 分钟
但是当我退出应用程序并再次启动它时，列表会像这样弹出（我必须将其识别为代码才能实现 post，但下面的信息显示在我的 table 这样):
<CCIEvent: 0x154e44e20>
<CCIEvent: 0x154e2c7b0>
<CCIEvent: 0x154e77b90>
我真的不知道去哪里找，但这里是与 saving/loading 相关的所有代码（我认为）：
在CCIEvent.m
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.startTime forKey:@"startTime"];
[aCoder encodeObject:self.bedTime forKey:@"bedTime"];
[aCoder encodeObject:self.wakeTime forKey:@"wakeTime"];
[aCoder encodeBool:self.isNap forKey:@"isNap"];
[aCoder encodeInt:self.feedDuration forKey:@"feedDuration"];
[aCoder encodeInt:self.sourceIndex forKey:@"sourceIndex"];
[aCoder encodeInt:self.diaperIndex forKey:@"diaperIndex"];
[aCoder encodeObject:self.note forKey:@"note"];
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super init];
if (self) {
_startTime = [aDecoder decodeObjectForKey:@"startTime"];
_bedTime = [aDecoder decodeObjectForKey:@"bedTime"];
_wakeTime = [aDecoder decodeObjectForKey:@"wakeTime"];
_isNap = [aDecoder decodeBoolForKey:@"isNap"];
_feedDuration = [aDecoder decodeIntForKey:@"feedDuration"];
_sourceIndex = [aDecoder decodeIntForKey:@"sourceIndex"];
_diaperIndex = [aDecoder decodeIntForKey:@"diaperIndex"];
_note = [aDecoder decodeObjectForKey:@"note"];
}
return self;
}
在CCIEventStore.m
- (instancetype)initPrivate
{
self = [super init];
if (self) {
NSString *path = [self eventArchivePath];
_privateEvents = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
// If the array hadn't been saved previously, create an empty one
if (!_privateEvents) {
_privateEvents = [[NSMutableArray alloc] init];
NSLog(@"Did NOT load events");
} else {
NSLog(@"Loaded events");
}
}
return self;
}
- (CCIEvent *)createEventWithEventType:(NSString *)eventType
startTime:(NSDate *)startTime
bedTime:(NSDate *)bedTime
wakeTime:(NSDate *)wakeTime
isNap:(BOOL)isNap
feedDuration:(int)feedDuration
sourceIndex:(int)sourceIndex
diaperIndex:(int)diaperIndex
note:(NSString *)note
{
CCIEvent *event = [[CCIEvent alloc] initWithEventType:eventType
startTime:startTime
bedTime:bedTime
wakeTime:wakeTime
isNap:isNap
feedDuration:feedDuration
sourceIndex:sourceIndex
diaperIndex:diaperIndex
note:note];
[self.privateEvents addObject:event];
return event;
}
- (NSString *)eventArchivePath
{
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories firstObject];
return [documentDirectory stringByAppendingPathComponent:@"events.archive"];
}
- (BOOL)saveChanges
{
NSString *path = [self eventArchivePath];
return [NSKeyedArchiver archiveRootObject:self.privateEvents
toFile:path];
}
在AppDelegate.m
- (void)applicationDidEnterBackground:(UIApplication *)application {
BOOL success = [[CCIEventStore sharedStore] saveChanges];
if (success) {
NSLog(@"Saved all of the CCIEvents");
} else {
NSLog(@"Could not save any of the CCIEvents");
}
}
这是来自视图控制器的一些代码，其中 table 是我调用的 CCILogViewController.m:
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"
forIndexPath:indexPath];
CCIEvent *event = self.sortedAndFilteredArray[indexPath.row];
if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime) {
NSDateComponents *dateComponentsToday = [[NSCalendar currentCalendar] components:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger yearToday = [dateComponentsToday year];
NSInteger dayOfYearToday = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:[NSDate date]];
NSDateComponents *dateComponentsEvent = [[NSCalendar currentCalendar] components:NSCalendarUnitYear
fromDate:event.startTime];
NSInteger yearEvent = [dateComponentsEvent year];
NSInteger dayOfYearEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.startTime];
NSInteger dayOfYearWakeEvent;
dayOfYearWakeEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.wakeTime];
if (event.wakeTime && yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearWakeEvent == dayOfYearToday) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else if (event.wakeTime && yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1 && dayOfYearWakeEvent == dayOfYearToday) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else {
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
}
} else if (self.dateOptionIndex == 2 || self.dateOptionIndex == 3) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else {
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
}
if (event.note) {
cell.accessoryType = UITableViewCellAccessoryDetailButton;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
下面是我如何获得 sortedAndFilteredArray，它在几个不同的地方被调用，包括 viewWillAppear：
- (void)sortAndFilterArray
{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"startTime" ascending:self.arrayIsAscending];
NSArray *sortedArray = [[[CCIEventStore sharedStore] allEvents] sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
NSMutableArray *sortedAndFilteredArray = [[NSMutableArray alloc] init];
NSMutableArray *finalArray = [[NSMutableArray alloc] init];
for (CCIEvent *event in sortedArray) {
switch (self.eventOptionIndex) {
case 1:
if ([event.eventType isEqualToString:@"sleepEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
case 2:
if ([event.eventType isEqualToString:@"feedEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
case 3:
if ([event.eventType isEqualToString:@"diaperEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
default:
[sortedAndFilteredArray addObject:event];
break;
}
}
NSDateComponents *dateComponentsToday = [[NSCalendar currentCalendar] components:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger yearToday = [dateComponentsToday year];
NSInteger dayOfYearToday = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:[NSDate date]];
for (CCIEvent *event in sortedAndFilteredArray) {
NSDateComponents *dateComponentsEvent = [[NSCalendar currentCalendar] components:NSCalendarUnitYear
fromDate:event.startTime];
NSInteger yearEvent = [dateComponentsEvent year];
NSInteger dayOfYearEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.startTime];
NSInteger dayOfYearWakeEvent;
switch (self.dateOptionIndex) {
case 0:
dayOfYearWakeEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.wakeTime];
// Filter here for dateIndex 0 (Today)
if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime && yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearWakeEvent == dayOfYearToday) {
[finalArray addObject:event];
} else if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime && yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1 && dayOfYearWakeEvent == dayOfYearToday) {
[finalArray addObject:event];
} else if (yearEvent == yearToday && dayOfYearEvent == dayOfYearToday) {
[finalArray addObject:event];
}
break;
case 1:
// Filter here for dateIndex 1 (Yesterday)
if (yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1) {
[finalArray addObject:event];
} else if (yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1) {
[finalArray addObject:event];
}
break;
case 2:
// Filter here for dateIndex 2 (Past Week)
if (yearEvent == yearToday && dayOfYearEvent >= dayOfYearEvent - 6) {
[finalArray addObject:event];
} else if (yearEvent == yearToday - 1 && dayOfYearEvent >= dayOfYearToday - 6 && dayOfYearEvent < 7) {
[finalArray addObject:event];
}
break;
default:
// No filter here for dateIndex 3 (All Time)
[finalArray addObject:event];
break;
}
}
self.sortedAndFilteredArray = [finalArray copy];
}
这是在获取 CCIEvent 的描述时调用的内容：
- (NSString *)description
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterNoStyle];
if ([self.eventType isEqualToString:@"sleepEvent"]) {
NSString *bedTimeString = [dateFormatter stringFromDate:self.bedTime];
NSString *wakeTimeString = [dateFormatter stringFromDate:self.wakeTime];
long min = self.sleepDuration/60;
long hrs = self.sleepDuration/60/60;
long rMinutes = min - hrs * 60;
if (!self.wakeTime && self.bedTime) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Went Down for Nap", bedTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Went Down", bedTimeString];
}
} else if (self.wakeTime && !self.bedTime) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Woke from Nap", wakeTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Woke", wakeTimeString];
}
} else if (self.sleepDuration <= 60) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - 1 min", bedTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - 1 min", bedTimeString];
}
} else if (self.sleepDuration > 60 && self.sleepDuration < 60 * 60){
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - %ld min", bedTimeString, min];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - %ld min", bedTimeString, min];
}
} else if (hrs == 1) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - 1 hr %ld min", bedTimeString, rMinutes];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - 1 hr %ld min", bedTimeString, rMinutes];
}
} else {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - %ld hrs %ld min", bedTimeString, hrs, rMinutes];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - %ld hrs %ld min", bedTimeString, hrs, rMinutes];
}
}
} else if ([self.eventType isEqualToString:@"feedEvent"]) {
NSString *startTimeString = [dateFormatter stringFromDate:self.startTime];
NSArray *sourceArray = @[@"Both", @"Left", @"Right", @"Bottle"];
NSString *sourceString = sourceArray[self.sourceIndex];
return [[NSString alloc] initWithFormat:@"%@: Fed - %@ - %d min", startTimeString, sourceString, self.feedDuration / 60];
} else if ([self.eventType isEqualToString:@"diaperEvent"]) {
NSString *startTimeString = [dateFormatter stringFromDate:self.startTime];
NSArray *diaperArray = @[@"Wet and Dirty", @"Wet", @"Dirty"];
NSString *diaperString = diaperArray[self.diaperIndex];
return [[NSString alloc] initWithFormat:@"%@: %@ Diaper", startTimeString, diaperString];
}
return [super description];
}
CCIEvent中有自定义描述方式吗？默认情况下，NSObject description 将显示对象的内存位置，这正是您所看到的。您可以通过创建一些非常简单的东西来进行基本测试，例如：
- (NSString *)description
{
return [[NSString alloc] initWithFormat:@"%@", self.note];
}
它似乎仍然没有在某处加载某些内容，或者我希望您在一般使用过程中看到该问题。如果你有 CCIEvent description 方法，你能 post 吗？我也很好奇 sortedAndFilteredArray.
您可以尝试通过 NSLog() 调用散布您的代码，以查看您是否在不同的点得到了您期望的结果。当应用程序运行时，请留意 XCode 控制台以查看您获得的数据。即，在 CCIEvent.m initWithCoder 中，您可以在 if (self) { 块的末尾添加如下内容：
NSLog(@"Got %@", _note);
或者甚至在此处检查您的描述方法：
NSLog([self description]);
还要确保在您的 encodeWithCoder 方法中执行一些 NSLog。我怀疑问题是在保存端发生的——有些事情阻止了事件细节的正确保存，所以当它们被恢复时它们是空的，所以在你的 cellForRowAtIndexPath 方法中它达到了默认条件并且只是在 CCIEvent 上调用描述，我怀疑它可能不存在并且正在执行显示内存位置的默认行为。如果我是对的，这表明 CCIEventStore 的 privateEvents 与您的详细信息视图中正在编辑的事件之间存在脱节。检查头文件中的对象属性，看看是否使用复制而不是强传递某个地方的 CCIEvent。
与错误无关，但仍值得注意 - cellForRowAtIndexPath 中的项目：
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
这些行可能与问题无关，但它们包含冗余访问器。由于您已经拥有：
CCIEvent *event = self.sortedAndFilteredArray[indexPath.row];
任何时候你想从事件中访问数据，你应该使用那个变量，所以上面的 textLabel 将是：
cell.textLabel.text = [event description];
cellForRowAtIndexPath 中还有其他一些地方可以使用类似的修改。
希望这对一些人有所帮助！
我在我的代码中加入了 NSLogs，并确定我的 CCIEvents 加载得很好。我发现奇怪的是，我的特殊描述在加载前有效，但在加载后无效。在加载之前它会给我我想要的字符串，但在加载之后它会指向内存。检查我的描述方法后，我注意到我默认返回超级的描述方法，除非 CCIEvent 满足特定条件，这迫使我意识到我的 CCIEvents 有一个我没有包含在 encodeWithCoder: 或 initWithCoder: 块中的 eventType 属性.我所要做的就是在其中添加 eventType，我的描述就会正常工作。非常感谢，克里斯！我真的把这个项目搁置了几个月，因为我太难了。
我对此很陌生，所以请多多包涵。
我使用 iOS 编程构建了一个应用程序：The Big Nerd Ranch Guide 4th ed called Homepwner 它利用归档在应用程序进入后台时存储信息并在它再次启动时加载信息，并且它工作得很好。我决定为我自己的名为 SBL 的应用程序实施相同的策略，但是当应用程序退出后加载时，数据似乎已加载但显示不正确。
该应用程序在 table 中显示了一个 "CCIEvent" 数组，它们看起来像示例：
7:00 AM：又湿又脏的尿布
8:48 AM：美联储 - 两者 - 20 分钟
上午 9:48：午睡 - 1 小时 0 分钟
但是当我退出应用程序并再次启动它时，列表会像这样弹出（我必须将其识别为代码才能实现 post，但下面的信息显示在我的 table 这样):
<CCIEvent: 0x154e44e20>
<CCIEvent: 0x154e2c7b0>
<CCIEvent: 0x154e77b90>
我真的不知道去哪里找，但这里是与 saving/loading 相关的所有代码（我认为）：
在CCIEvent.m
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.startTime forKey:@"startTime"];
[aCoder encodeObject:self.bedTime forKey:@"bedTime"];
[aCoder encodeObject:self.wakeTime forKey:@"wakeTime"];
[aCoder encodeBool:self.isNap forKey:@"isNap"];
[aCoder encodeInt:self.feedDuration forKey:@"feedDuration"];
[aCoder encodeInt:self.sourceIndex forKey:@"sourceIndex"];
[aCoder encodeInt:self.diaperIndex forKey:@"diaperIndex"];
[aCoder encodeObject:self.note forKey:@"note"];
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super init];
if (self) {
_startTime = [aDecoder decodeObjectForKey:@"startTime"];
_bedTime = [aDecoder decodeObjectForKey:@"bedTime"];
_wakeTime = [aDecoder decodeObjectForKey:@"wakeTime"];
_isNap = [aDecoder decodeBoolForKey:@"isNap"];
_feedDuration = [aDecoder decodeIntForKey:@"feedDuration"];
_sourceIndex = [aDecoder decodeIntForKey:@"sourceIndex"];
_diaperIndex = [aDecoder decodeIntForKey:@"diaperIndex"];
_note = [aDecoder decodeObjectForKey:@"note"];
}
return self;
}
在CCIEventStore.m
- (instancetype)initPrivate
{
self = [super init];
if (self) {
NSString *path = [self eventArchivePath];
_privateEvents = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
// If the array hadn't been saved previously, create an empty one
if (!_privateEvents) {
_privateEvents = [[NSMutableArray alloc] init];
NSLog(@"Did NOT load events");
} else {
NSLog(@"Loaded events");
}
}
return self;
}
- (CCIEvent *)createEventWithEventType:(NSString *)eventType
startTime:(NSDate *)startTime
bedTime:(NSDate *)bedTime
wakeTime:(NSDate *)wakeTime
isNap:(BOOL)isNap
feedDuration:(int)feedDuration
sourceIndex:(int)sourceIndex
diaperIndex:(int)diaperIndex
note:(NSString *)note
{
CCIEvent *event = [[CCIEvent alloc] initWithEventType:eventType
startTime:startTime
bedTime:bedTime
wakeTime:wakeTime
isNap:isNap
feedDuration:feedDuration
sourceIndex:sourceIndex
diaperIndex:diaperIndex
note:note];
[self.privateEvents addObject:event];
return event;
}
- (NSString *)eventArchivePath
{
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [documentDirectories firstObject];
return [documentDirectory stringByAppendingPathComponent:@"events.archive"];
}
- (BOOL)saveChanges
{
NSString *path = [self eventArchivePath];
return [NSKeyedArchiver archiveRootObject:self.privateEvents
toFile:path];
}
在AppDelegate.m
- (void)applicationDidEnterBackground:(UIApplication *)application {
BOOL success = [[CCIEventStore sharedStore] saveChanges];
if (success) {
NSLog(@"Saved all of the CCIEvents");
} else {
NSLog(@"Could not save any of the CCIEvents");
}
}
这是来自视图控制器的一些代码，其中 table 是我调用的 CCILogViewController.m:
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"
forIndexPath:indexPath];
CCIEvent *event = self.sortedAndFilteredArray[indexPath.row];
if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime) {
NSDateComponents *dateComponentsToday = [[NSCalendar currentCalendar] components:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger yearToday = [dateComponentsToday year];
NSInteger dayOfYearToday = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:[NSDate date]];
NSDateComponents *dateComponentsEvent = [[NSCalendar currentCalendar] components:NSCalendarUnitYear
fromDate:event.startTime];
NSInteger yearEvent = [dateComponentsEvent year];
NSInteger dayOfYearEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.startTime];
NSInteger dayOfYearWakeEvent;
dayOfYearWakeEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.wakeTime];
if (event.wakeTime && yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearWakeEvent == dayOfYearToday) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else if (event.wakeTime && yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1 && dayOfYearWakeEvent == dayOfYearToday) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else {
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
}
} else if (self.dateOptionIndex == 2 || self.dateOptionIndex == 3) {
cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", [dateFormatter stringFromDate:event.startTime], [self.sortedAndFilteredArray[indexPath.row] description]];
} else {
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
}
if (event.note) {
cell.accessoryType = UITableViewCellAccessoryDetailButton;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
下面是我如何获得 sortedAndFilteredArray，它在几个不同的地方被调用，包括 viewWillAppear：
- (void)sortAndFilterArray
{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"startTime" ascending:self.arrayIsAscending];
NSArray *sortedArray = [[[CCIEventStore sharedStore] allEvents] sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
NSMutableArray *sortedAndFilteredArray = [[NSMutableArray alloc] init];
NSMutableArray *finalArray = [[NSMutableArray alloc] init];
for (CCIEvent *event in sortedArray) {
switch (self.eventOptionIndex) {
case 1:
if ([event.eventType isEqualToString:@"sleepEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
case 2:
if ([event.eventType isEqualToString:@"feedEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
case 3:
if ([event.eventType isEqualToString:@"diaperEvent"]) {
[sortedAndFilteredArray addObject:event];
}
break;
default:
[sortedAndFilteredArray addObject:event];
break;
}
}
NSDateComponents *dateComponentsToday = [[NSCalendar currentCalendar] components:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger yearToday = [dateComponentsToday year];
NSInteger dayOfYearToday = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:[NSDate date]];
for (CCIEvent *event in sortedAndFilteredArray) {
NSDateComponents *dateComponentsEvent = [[NSCalendar currentCalendar] components:NSCalendarUnitYear
fromDate:event.startTime];
NSInteger yearEvent = [dateComponentsEvent year];
NSInteger dayOfYearEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.startTime];
NSInteger dayOfYearWakeEvent;
switch (self.dateOptionIndex) {
case 0:
dayOfYearWakeEvent = [[NSCalendar currentCalendar] ordinalityOfUnit:NSCalendarUnitDay
inUnit:NSCalendarUnitYear
forDate:event.wakeTime];
// Filter here for dateIndex 0 (Today)
if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime && yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearWakeEvent == dayOfYearToday) {
[finalArray addObject:event];
} else if ([event.eventType isEqualToString:@"sleepEvent"] && event.wakeTime && yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1 && dayOfYearWakeEvent == dayOfYearToday) {
[finalArray addObject:event];
} else if (yearEvent == yearToday && dayOfYearEvent == dayOfYearToday) {
[finalArray addObject:event];
}
break;
case 1:
// Filter here for dateIndex 1 (Yesterday)
if (yearEvent == yearToday && dayOfYearEvent == dayOfYearToday - 1) {
[finalArray addObject:event];
} else if (yearEvent == yearToday - 1 && dayOfYearEvent == dayOfYearToday - 1 && dayOfYearEvent == 1) {
[finalArray addObject:event];
}
break;
case 2:
// Filter here for dateIndex 2 (Past Week)
if (yearEvent == yearToday && dayOfYearEvent >= dayOfYearEvent - 6) {
[finalArray addObject:event];
} else if (yearEvent == yearToday - 1 && dayOfYearEvent >= dayOfYearToday - 6 && dayOfYearEvent < 7) {
[finalArray addObject:event];
}
break;
default:
// No filter here for dateIndex 3 (All Time)
[finalArray addObject:event];
break;
}
}
self.sortedAndFilteredArray = [finalArray copy];
}
这是在获取 CCIEvent 的描述时调用的内容：
- (NSString *)description
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterNoStyle];
if ([self.eventType isEqualToString:@"sleepEvent"]) {
NSString *bedTimeString = [dateFormatter stringFromDate:self.bedTime];
NSString *wakeTimeString = [dateFormatter stringFromDate:self.wakeTime];
long min = self.sleepDuration/60;
long hrs = self.sleepDuration/60/60;
long rMinutes = min - hrs * 60;
if (!self.wakeTime && self.bedTime) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Went Down for Nap", bedTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Went Down", bedTimeString];
}
} else if (self.wakeTime && !self.bedTime) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Woke from Nap", wakeTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Woke", wakeTimeString];
}
} else if (self.sleepDuration <= 60) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - 1 min", bedTimeString];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - 1 min", bedTimeString];
}
} else if (self.sleepDuration > 60 && self.sleepDuration < 60 * 60){
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - %ld min", bedTimeString, min];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - %ld min", bedTimeString, min];
}
} else if (hrs == 1) {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - 1 hr %ld min", bedTimeString, rMinutes];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - 1 hr %ld min", bedTimeString, rMinutes];
}
} else {
if (self.isNap) {
return [[NSString alloc] initWithFormat:@"%@: Napped - %ld hrs %ld min", bedTimeString, hrs, rMinutes];
} else {
return [[NSString alloc] initWithFormat:@"%@: Slept - %ld hrs %ld min", bedTimeString, hrs, rMinutes];
}
}
} else if ([self.eventType isEqualToString:@"feedEvent"]) {
NSString *startTimeString = [dateFormatter stringFromDate:self.startTime];
NSArray *sourceArray = @[@"Both", @"Left", @"Right", @"Bottle"];
NSString *sourceString = sourceArray[self.sourceIndex];
return [[NSString alloc] initWithFormat:@"%@: Fed - %@ - %d min", startTimeString, sourceString, self.feedDuration / 60];
} else if ([self.eventType isEqualToString:@"diaperEvent"]) {
NSString *startTimeString = [dateFormatter stringFromDate:self.startTime];
NSArray *diaperArray = @[@"Wet and Dirty", @"Wet", @"Dirty"];
NSString *diaperString = diaperArray[self.diaperIndex];
return [[NSString alloc] initWithFormat:@"%@: %@ Diaper", startTimeString, diaperString];
}
return [super description];
}
CCIEvent中有自定义描述方式吗？默认情况下，NSObject description 将显示对象的内存位置，这正是您所看到的。您可以通过创建一些非常简单的东西来进行基本测试，例如：
- (NSString *)description
{
return [[NSString alloc] initWithFormat:@"%@", self.note];
}
它似乎仍然没有在某处加载某些内容，或者我希望您在一般使用过程中看到该问题。如果你有 CCIEvent description 方法，你能 post 吗？我也很好奇 sortedAndFilteredArray.
您可以尝试通过 NSLog() 调用散布您的代码，以查看您是否在不同的点得到了您期望的结果。当应用程序运行时，请留意 XCode 控制台以查看您获得的数据。即，在 CCIEvent.m initWithCoder 中，您可以在 if (self) { 块的末尾添加如下内容：
NSLog(@"Got %@", _note);
或者甚至在此处检查您的描述方法：
NSLog([self description]);
还要确保在您的 encodeWithCoder 方法中执行一些 NSLog。我怀疑问题是在保存端发生的——有些事情阻止了事件细节的正确保存，所以当它们被恢复时它们是空的，所以在你的 cellForRowAtIndexPath 方法中它达到了默认条件并且只是在 CCIEvent 上调用描述，我怀疑它可能不存在并且正在执行显示内存位置的默认行为。如果我是对的，这表明 CCIEventStore 的 privateEvents 与您的详细信息视图中正在编辑的事件之间存在脱节。检查头文件中的对象属性，看看是否使用复制而不是强传递某个地方的 CCIEvent。
与错误无关，但仍值得注意 - cellForRowAtIndexPath 中的项目：
cell.textLabel.text = [self.sortedAndFilteredArray[indexPath.row] description];
这些行可能与问题无关，但它们包含冗余访问器。由于您已经拥有：
CCIEvent *event = self.sortedAndFilteredArray[indexPath.row];
任何时候你想从事件中访问数据，你应该使用那个变量，所以上面的 textLabel 将是：
cell.textLabel.text = [event description];
cellForRowAtIndexPath 中还有其他一些地方可以使用类似的修改。
希望这对一些人有所帮助！
我在我的代码中加入了 NSLogs，并确定我的 CCIEvents 加载得很好。我发现奇怪的是，我的特殊描述在加载前有效，但在加载后无效。在加载之前它会给我我想要的字符串，但在加载之后它会指向内存。检查我的描述方法后，我注意到我默认返回超级的描述方法，除非 CCIEvent 满足特定条件，这迫使我意识到我的 CCIEvents 有一个我没有包含在 encodeWithCoder: 或 initWithCoder: 块中的 eventType 属性.我所要做的就是在其中添加 eventType，我的描述就会正常工作。非常感谢，克里斯！我真的把这个项目搁置了几个月，因为我太难了。