iOS 收起鍵盤

//方法1;

    

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

//方法2;

    [self.view endEditing:YES];

//方法3;

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    [telTextField resignFirstResponder];

}

//方法4;

  [self.myTF resignFirstResponder];