问题描述

我以编程方式创建了一个 UITextField，使 UITextField 成为 viewController 的一个属性.我需要通过返回和触摸屏幕来关闭键盘.我能够让屏幕触摸消失，但按回车键不起作用.

I created a UITextField programmatically making the UITextField a property of the viewController. I need to dismiss the keyboard with the return and the touch on the screen. I was able to get the screen touch to dismiss, but pressing return is not working.

我已经了解了如何使用情节提要以及直接分配和初始化 UITextField 对象而不将其创建为属性.可以吗?

I've seen how to do it with storyboards and by allocating and initializing the UITextField object directly without creating it as a property. Possible to do?

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITextFieldDelegate>

@property (strong, atomic) UITextField *username;

@end

.m

#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.view.backgroundColor = [UIColor blueColor];
    self.username = [[UITextField alloc] initWithFrame:CGRectMake(100, 25, 80, 20)];
    self.username.placeholder = @"Enter your username";
    self.username.backgroundColor = [UIColor whiteColor];
    self.username.borderStyle = UITextBorderStyleRoundedRect;
    if (self.username.placeholder != nil) {
        self.username.clearsOnBeginEditing = NO;
    }
    _username.delegate = self; 
    
    [self.view addSubview:self.username];
    [_username resignFirstResponder];
    
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"touchesBegan:withEvent:");
    [self.view endEditing:YES];
    [super touchesBegan:touches withEvent:event];
}

@end

推荐答案

简单的方法是将UITextField的delegate连接到self(self.mytestField.delegate = self) 并在方法 textFieldShouldReturn 中使用 [textField resignFirstResponder];

The simple way is to connect the delegate of UITextField to self (self.mytestField.delegate = self) and dismiss the keyboard in the method textFieldShouldReturn using [textField resignFirstResponder];

另一种关闭键盘的方法如下:

Another way to dismiss the keyboard is the following:

Objective-C

[self.view endEditing:YES];

斯威夫特:

self.view.endEditing(true)

将 [self.view endEditing:YES]; 放在您想要关闭键盘的位置(按钮事件、触摸事件等).

Put [self.view endEditing:YES]; where you would like to dismiss the keyboard (Button event, Touch event, etc.).

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