Question

我是iOS新手。我正在构建一个示例项目。我的项目中有四个viewControllers。在第一个中有两个文本字段。一个是进入国家，另一个是进入城市。点击它们中的每一个，完成第二个viewController。在第二个，第三个和第四个viewControllers中，我在每个中都有tableViews。

第二个viewController中的表视图我有一个国家列表，第三个viewController中的表视图我有一个状态列表，在第四个viewController的表视图中我有一个城市列表。

点击每个tableview的单元格推送到下一个。

现在我的要求是，当我点击国家/地区文本字段时，推送将仅执行到第二个viewController，当我点击城市时，textField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textField完成的。

感谢任何帮助。提前谢谢。

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

我认为你已经为textfield提供了标签。如果标签是1，那么国家文本字段，否则是城市文本字段。通过识别标签，你可以切换到相应的视图控制器。

- (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，

创建一个实例变量，用于保存所选文本字段的标记。

@interface ViewController() {
    NSInteger tagSelectedTextField;
}

在您的第一个ViewController中，使用setTag:方法为您的TextField分配标记。

- (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;
}

现在当你在代表中时，检查标签并相应地执行segue。

- (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，请使用此标记通过[self.view viewWithTag:tagSelectedTextField]取回所选文本字段并相应地更新文本。

如何知道通过点击哪个文本字段，推送完成

2 个答案: