UITextField ios键盘

ios键盘(搜索按钮)

//键盘右下角  

//枚举
typedef NS_ENUM(NSInteger, UIReturnKeyType) {
    UIReturnKeyDefault,             //默认：灰色按钮，标有Return
    UIReturnKeyGo,                  //标有Go的蓝色按钮
    UIReturnKeyGoogle,              //标有Google的蓝色按钮，用于搜索
    UIReturnKeyJoin,                //标有Join的蓝色按钮
    UIReturnKeyNext,                //标有Next的蓝色按钮 
    UIReturnKeyRoute,               //标有Route的蓝色按钮 
    UIReturnKeySearch,              //标有Search的蓝色按钮
    UIReturnKeySend,                //标有Send的蓝色按钮
    UIReturnKeyYahoo,               //标有Yahoo!的蓝色按钮，用于搜索
    UIReturnKeyDone,                //标有Done的蓝色按钮
    UIReturnKeyEmergencyCall,       //紧急呼叫按钮
    UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),
};

//用法用例：  
xxx.returnKeyType = UIReturnKeyGo;  
这个时候你发现按钮不管用 
那么我们该看看代理到底有什么方法

//UITextFieldDelegate  
- (BOOL)textFieldShouldReturn:(UITextField *)textField;  

类似这个方法 就可以加处理了
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版权声明：本文为CSDN博主「巴糖0547」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/heberan/article/details/52215417

 

UITextField 监听数值变化的四种方法

UITextField 监听数值变化的四种方法

1.直接监听 - 推荐

 

-(void)addTargetMethod{
    [self.textField1 addTarget:self action:@selector(textField1TextChange:) forControlEvents:UIControlEventEditingChanged];
}
-(void)textField1TextChange:(UITextField *)textField{
    NSLog(@"textField1 - 输入框内容改变,当前内容为: %@",textField.text);
}

2.NSNotificationCenter 添加监听方法

 

#pragma mark - NSNotificationCenter 添加监听方法
-(void)addNSNotificationCenter{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textField2TextChange:) name:UITextFieldTextDidChangeNotification object:self.textField2];
}
-(void)textField2TextChange:(NSNotification *)noti{
    UITextField *currentTextField = (UITextField *)noti.object;
    NSLog(@"textField2 - 输入框内容改变,当前内容为: %@",currentTextField.text);
}
-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

3.KVO : 注意这种方法不会直接监听键盘输入而是监听 textField.text 的改变,代码设置才会有效

 

-(void)addKVO{
    [self.textField3 addObserver:self forKeyPath:@"text" options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:nil];
    self.textField3.text = @"123";
}
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    if ([keyPath isEqualToString:@"text"] && object == self.textField3) {
        NSLog(@"textField3 - 输入框内容改变,当前内容为: %@",self.textField3.text);
    }else{
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}
-(void)dealloc{
    [self.textField3 removeObserver:self forKeyPath:@"text" context:nil];
}

4.代理(可以判断接下来是否允许继续输入)

 

#pragma mark - 代理
-(void)addDelegate{
    //实现 UITextFieldDelegate 协议
    self.textField4.delegate = self;
}
#pragma mark  UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    return YES;
}// return NO to disallow editing.
- (void)textFieldDidBeginEditing:(UITextField *)textField{
    NSLog(@"textField4 - 开始编辑");
}// became first responder
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{
    return YES;
}// return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
- (void)textFieldDidEndEditing:(UITextField *)textField{
    NSLog(@"textField4 - 结束编辑");
}// may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called
- (void)textFieldDidEndEditing:(UITextField *)textField reason:(UITextFieldDidEndEditingReason)reason NS_AVAILABLE_IOS(10_0){

}// if implemented, called in place of textFieldDidEndEditing:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
     NSLog(@"textField4 - 正在编辑, 当前输入框内容为: %@",textField.text);
    return YES;
}// return NO to not change text

作者：Yeso
链接：https://www.jianshu.com/p/2fb5c9b8ea4c
来源：简书
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