ios - 拦截 UITextField touch

Question

我想拦截 UITextField 上的触摸，例如，当我第一次加载它时，我给它一个 @selector() 来加载一个不同的方法，而不是delegate 东西？

这是我的尝试:

descriptionText = [[UITextField alloc] initWithFrame:CGRectMake(10.0, 25.0, infoView.frame.size.width - 20, 100.0)];
    descriptionText.backgroundColor = [UIColor whiteColor];
    descriptionText.textColor = [UIColor blackColor];
    descriptionText.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
    descriptionText.userInteractionEnabled = YES;
    [descriptionText addTarget:self action:@selector(loadInfoView:) forControlEvents:UIControlEventTouchUpInside];
    descriptionText.font = [UIFont fontWithName:@"Helvetica" size:15];
    // show view
    [infoView addSubview:descriptionText];

但是当我调试方法时:

- (void)loadInfoView
{
    NSLog(@"load other view here");
}

Answer 1

您的问题出在forControlEvents::尝试UIControlEventEditingDidBegin

[descriptionText addTarget:self action:@selector(loadInfoView:) UIControlEventEditingDidBegin];

如果你有 - (void)loadInfoView，你的 @selector(loadInfoView:) 也是错误的>

或@selector(loadInfoView:) 和- (void)loadInfoView: (id) sender
或 @selector(loadInfoView) 和 - (void)loadInfoView

但是，为什么不使用 UITextFieldDelegate？

.m

@interface ViewController () <UITextFieldDelegate>

    @property (strong, nonatomic) UITextField *descriptionText;

@end

切记:

self.descriptionText.delegate = self;

然后:

-(void) textFieldDidBeginEditing:(UITextField *)textField
{
    if (textField == self.descriptionText)
    {
        [self loadInfoView];
    }

}

键盘:

如果你不想显示键盘你需要添加一个[descriptionText resignFirstResponder];