UIView 未在 UIViewController 中加载

Question

尝试将 UIView 加载到 UIViewController 中的 table 视图的 header 中，我正在执行以下操作，但由于某种原因无法正常工作.正在添加视图，但未显示图表..

在UIView,

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        [self symbolLookup];
    }
    return self;
}


-(void)symbolLookup{

    MAFinance *stockQuery = [MAFinance new];
    // set the symbol
    stockQuery.symbol = @"goog";

    /* set time period
     MAFinanceTimeFiveDays
     MAFinanceTimeTenDays
     MAFinanceTimeOneMonth
     MAFinanceTimeThreeMonths
     MAFinanceTimeOneYear
     MAFinanceTimeFiveYears
     */
    stockQuery.period = MAFinanceTimeOneMonth;
    [stockQuery findStockDataWithBlock:^(NSDictionary *stockData, NSError *error) {
        if (!error) {

            // we've got our data
            self.allData = stockData;
            NSLog(@"%@", [[self.allData objectForKey:@"StockInformation"] allKeys]);

            self.pricesArray = [stockData objectForKey:@"Prices"];
            self.datesArray = [stockData objectForKey:@"Dates"];
            self.maV = [MAStockGraph new];
            self.maV.delegate = self;
            [self addSubview:self.maV];
            [self.maV reloadGraph];

        } else {
            // something went wrong, log the error
            NSLog(@"Error - %@", error.localizedDescription);
        }
    }];
}

并且在视图控制器中，

    - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
    StockView *view = [[StockView alloc]initWithFrame:tableView.frame];
    return view.maV;
}

Answer 1

您正在（可能）异步调用中分配 maV 一个值：findStockDataWithBlock。

而是在块外部实例化视图，然后在执行块时更新其值。

self.maV = [MAStockGraph new];
self.maV.delegate = self;
[stockQuery findStockDataWithBlock:^(NSDictionary *stockData, NSError *error) {
    if (!error) {

        // we've got our data
        self.allData = stockData;
        NSLog(@"%@", [[self.allData objectForKey:@"StockInformation"] allKeys]);

        self.pricesArray = [stockData objectForKey:@"Prices"];
        self.datesArray = [stockData objectForKey:@"Dates"];
        [self.maV reloadGraph];

    } else {
        // something went wrong, log the error
        NSLog(@"Error - %@", error.localizedDescription);
    }
}];

不得不指出，你的做法很奇怪。为什么要创建一个视图以获取其子视图之一并丢弃原始视图？考虑对其进行重组，以便您直接创建 MAStockGraph 并将其传递给外部数据源，或者传回您创建的视图而不是子视图。

Answer 2

在你块中，在 [self.maV reloadGraph] 之后；只需调用 -[setNeedsDisplay] 即可显示新结果。

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