objective C控制点击背景时关闭键盘

在viewDidLoad中添加手势识别器,handleBackgroundTap:使文本字段取消第一响应者状态.

- (void)viewDidLoad
{
    [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
    UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
                                             initWithTarget:self action:@selector(handleBackgroundTap:)];
    tapRecognizer.cancelsTouchesInView = NO;
    [self.view addGestureRecognizer:tapRecognizer];
}
 
- (void) handleBackgroundTap:(UITapGestureRecognizer*)sender
{
    [nameField resignFirstResponder];
    [SexField resignFirstResponder];
}