如何知道通过单击哪个文本字段，推送已完成

Question

我是 iOS 的新人。我正在构建一个示例项目。我的项目中有四个 viewController。在第一个中有两个文本字段。一个是进乡，一个是进城。点击它们中的每一个，推到第二个 viewController 就完成了。在第二个、第三个和第四个 viewController 中，我每个人都有 table 个视图。

第二个 table 视图 viewController 我有一个国家列表，第三个 table 视图 viewController 我有一个州列表第四个 viewController 中的 table 视图我有一个城市列表。

点击每个 table 视图推送的单元格即可完成下一个视图推送。

现在我的要求是，当我点击国家文本字段时，推送只会完成到第二个 viewController 而当我点击城市文本字段时，推送将完成到第四个 viewController.

我想知道的是，如何知道推送是从哪个文本字段完成的。

感谢任何帮助。提前致谢。

这是我的第一个viewController实现文件...

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.txtCity.delegate = self;
    self.txtCountry.delegate = self;
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    if (textField.tag == 1) {
        [self performSegueWithIdentifier:@"countryScene" sender:self];
    } else{
        [self performSegueWithIdentifier:@"countryScene" sender:self];
    }
    return YES;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

这是我的第二个 viewController 实现文件..

#import "CountryViewController.h"

@interface CountryViewController ()

@end

@implementation CountryViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.arrCountries = @[@"India", @"Bangladesh", @"Australia", @"New Zealand", @"South Africa", @"West Indies", @"Sri Lanka", @"England", @"Argentina", @"Brazil"];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"countryCell"];

    UILabel *lblCountry = (UILabel*)[cell.contentView viewWithTag:3];
    lblCountry.text = [self.arrCountries objectAtIndex:indexPath.row];

    return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return [self.arrCountries count];

}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [self performSegueWithIdentifier: @"stateScene" sender: self];
}

@end

这是我的第三个viewController实现文件：

#import "StateViewController.h"

@interface StateViewController ()

@end

@implementation StateViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.arrStates = @[@"West Bengal", @"Uttar Pradesh", @"Madhya Pradesh", @"Jharkhand", @"Bihar", @"Tamilnadu", @"Myanmar", @"Arunachal Pradesh", @"Assam", @"Goa"];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"stateCell"];

    UILabel *lblStates = (UILabel*)[cell.contentView viewWithTag:4];
    lblStates.text = [self.arrStates objectAtIndex:indexPath.row];

    return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return [self.arrStates count];

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [self performSegueWithIdentifier: @"cityScene" sender: self];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

这是我的第四个viewController实现文件...

#import "CityViewController.h"

@interface CityViewController ()

@end

@implementation CityViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
self.arrCities = @[@"Kolkata", @"Bangalore", @"Chennai", @"Mumbai", @"Hyderabad", @"Mangalore", @"New York", @"London", @"Rio de Janeiro", @"Buenos Aires"];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cityCell"];

    UILabel *lblCities = (UILabel*)[cell.contentView viewWithTag:5];
lblCities.text = [self.arrCities objectAtIndex:indexPath.row];

    return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return [self.arrCities count];

}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [self performSegueWithIdentifier: @"showRecipeDetail" sender: self];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

我想你已经给了标签 textfield.If 标签是 1 然后是国家文本字段，否则它的城市 textfield.By 识别标签你可以切换到各自的视图控制器。

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{

 if (textField.tag == 1) {
 //Country view Controller
 [self performSegueWithIdentifier:@"countryScene" sender:self];
}
 else{
//City View Controller   
 [self performSegueWithIdentifier:@"cityScene" sender:self];
}

  return YES;
}

Answer 2

好的，

创建一个包含所选文本字段标签的实例变量。

@interface ViewController() {
    NSInteger tagSelectedTextField;
}

在您的第一个 ViewController 中，使用 setTag: 方法将标签分配给您的 TextFields。

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self.textCity setTag:1];
    [self.textCountry setTag:2];
    self.txtCity.delegate = self;
    self.txtCountry.delegate = self;
}

现在，当您在委托中时，检查标签并相应地执行转场。

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{


    if (textField.tag == 1) {

         [self performSegueWithIdentifier:@"cityScene" sender:self];
    } else{

         [self performSegueWithIdentifier:@"countryScene" sender:self];
    }
    tagSelectedTextField = textField.tag;
    return YES;
}

现在，当您返回此屏幕或使用通知系统时，使用此标签通过 [self.view viewWithTag:tagSelectedTextField] 取回您选择的文本字段并相应地更新文本。

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