UITextField控件之ValueChanged事件

来源：互联网发布：阿里云计算认证考试编辑：程序博客网时间：2024/06/05 01:06

From: http://wuchaorang.2008.blog.163.com/blog/static/48891852201402184156861/

1.UITextField的UIControlEventValueChanged事件单独注册，你会发现根本不执行，需要多注册一个通知事件，才可以监听到UITextField的值改变事件

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldChange:) name:UITextFieldTextDidChangeNotification object:nil];

2.举例说明：

- (void)dealloc{
    [super dealloc];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextFieldTextDidChangeNotification object:nil];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
 UITextField *textField=[[UITextField alloc] initWithFrame:CGRectMake(10, 10, 300, 35)];
    textField.borderStyle=UITextBorderStyleRoundedRect;
    textField.contentHorizontalAlignment=UIControlContentVerticalAlignmentCenter;
//UITextFieldTextDidChangeNotification通知事件[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldChange:) name:UITextFieldTextDidChangeNotification object:nil];
 //注册UIControlEventValueChanged事件
[textField addTarget:self action:@selector(textFieldChange:) forControlEvents:UIControlEventValueChanged];
  //添加到页面
 [self.view addSubView: textField];
  [textField release];
}

- (void)textFieldChange:(NSNotification*)notifice{
    UITextField *field=[notifice object];
    NSLog(@"text=%@",field.text);
}

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