【ios】点击显示输入框密码

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- (void)viewDidLoad {
    [super viewDidLoad];
    
    _showPwd.tag = 100;  //按钮的初始状态标记
    
}

- (IBAction)showPwdClicked:(UIButton *)sender {
    switch (_showPwd.tag) {
            //To show password
        case 100:
            _password.secureTextEntry = NO;
            _showPwd.tag = 200; //点击后改变状态标记
            break;
            
        case 200:
            _password.secureTextEntry = YES;
            _showPwd.tag = 100;
            break;
    }
}