UITextField 事件监听四种方式

一、添加监听对象

-(void)awakeFromNib{
    [super awakeFromNib];
    [self addTarget:self action:@selector(textFildBegin) forControlEvents:UIControlEventEditingDidBegin];
    [self addTarget:self action:@selector(textFildEnd) forControlEvents:UIControlEventEditingDidEnd];
    
    
    
}
-(void)textFildBegin{
    NSLog(@"begin");

}

-(void)textFildEnd{
    NSLog(@"end");
}

二、代理

@interface ViewController ()<UITextFieldDelegate>
@property (weak, nonatomic) IBOutlet XMGLoginTextField *phoneNumber;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.phoneNumber.delegate = self;
    // Do any additional setup after loading the view, typically from a nib.
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
#pragma mark -UITextFieldDelegate
-(void)textFieldDidBeginEditing:(UITextField *)textField{
    NSLog(@"begin");
}

-(void)textFieldDidEndEditing:(UITextField *)textField{
    NSLog(@"end");
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    [self.view endEditing:YES];
}

三、通知

- (void)awakeFromNib
{
    // 设置光标颜色
    self.tintColor = [UIColor whiteColor];
    // 设置默认的占位文字颜色
    [self setValue:[UIColor grayColor] forKeyPath:XMGPlaceholderColorKey];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(beginEditing) name:UITextFieldTextDidBeginEditingNotification object:self];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endEditing) name:UITextFieldTextDidEndEditingNotification object:self];
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)beginEditing
{
    [self setValue:[UIColor whiteColor] forKeyPath:XMGPlaceholderColorKey];
}

- (void)endEditing
{
    [self setValue:[UIColor grayColor] forKeyPath:XMGPlaceholderColorKey];
}
@end

四、是否是键盘的第一响应用者

//键盘出现
-(BOOL)becomeFirstResponder{
        self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
    return [super becomeFirstResponder];
}

//键盘退出
-(BOOL)resignFirstResponder{
    self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:@{NSForegroundColorAttributeName:[UIColor darkGrayColor]}];
    return [super resignFirstResponder];
}