iphone - 如何在代码而不是 Interface Builder 中设置 didEndOnExit？

这个问题在这里已经有了答案:

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Best Answer-推荐答案

假设您谈论的是 textFieldDidEndEditing: 或 textFieldShouldReturn:。您将在 View Controller 中实现该方法，并将文本字段 delegate 设置为 self，如下所示:

- (void)viewDidLoad {
    [super viewDidLoad];
    // ....
    myTextField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 50, 25)];
    myTextField.delegate = self;
    [self.view addSubview:myTextField];
}

- (void)textFieldDidEndEditingUITextField *)textField {
    if (textField == myTextField) {
        // Do stuff...
    }
}

- (BOOL)textFieldShouldReturnUITextField *)textField {
    if (textField == myTextField) {
        return YES;
    }
    return NO;
}

- (BOOL)textFieldUITextField *)textField shouldChangeCharactersInRangeNSRange)range replacementStringNSString *)string {
    if ((myTextField.text.length + string.length) < 5) {
        return YES;
    }
    return NO;
}

然后，在 @interface 的头文件中，您可以像这样指定您是 UITextFieldDelegate:

@interface MyViewController : UIViewController <UITextFieldDelegate> {
    // ....
    UITextField *myTextField;
    // ....
}

// Optionally, to make myTextField a property:
@property (nonatomic, retain) UITextField *myTextField;

@end

UITextField Reference
UITextFieldDelegate Reference

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编辑(根据您的评论，这应该可以):

- (BOOL)textFieldUITextField *)textField shouldChangeCharactersInRangeNSRange)range replacementStringNSString *)string {
    if ((myTextField.text.length + string.length) < 5) {
        return YES;
    }
    return NO;
}

关于iphone - 如何在代码而不是 Interface Builder 中设置 didEndOnExit？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7771985/