动画不会第一次运行

Question

我有一个奇怪的错误。当我的应用程序加载时，我点击一个按钮来做一个动画，它不承诺动画，但当我第二次尝试完美的作品。继承人我的代码：

-(void)Revert 
{ 

    firstTable.hidden = FALSE; 
    self.navigationItem.leftBarButtonItem = NO; 
    [self returnanimation]; 
} 

-(void)returnanimation 
{ 
    CGRect labelframe = childnamelabel.frame; 
    labelframe.origin.x = 493.5; // new x coordinate 
    labelframe.origin.y = 359; // new y coordinate 
    CGRect textframe = passwordfield.frame; 
    textframe.origin.x = 454; // new x coordinate 
    textframe.origin.y = 388; // new y coordinate 
    CGRect submitframe = submit.frame; 
    submitframe.origin.x = 640; // new x coordinate 
    submitframe.origin.y = 387; // new y coordinate 

    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration: 0.25]; 
    childnamelabel.frame = labelframe; 
    passwordfield.frame = textframe; 
    submit.frame = submitframe; 
    [UIView commitAnimations]; 
} 

-(void)animation 
{ 


    CGRect labelframe = childnamelabel.frame; 
    labelframe.origin.x = 335.5; // new x coordinate 
    labelframe.origin.y = 359; // new y coordinate 
    CGRect textframe = passwordfield.frame; 
    textframe.origin.x = 294; // new x coordinate 
    textframe.origin.y = 388; // new y coordinate 
    CGRect submitframe = submit.frame; 
    submitframe.origin.x = 480; // new x coordinate 
    submitframe.origin.y = 387; // new y coordinate 
    [UIView beginAnimations:nil context:nil]; 
    [UIView setAnimationDuration: 0.25]; 

    childnamelabel.frame = labelframe; 
    passwordfield.frame = textframe; 
    submit.frame = submitframe; 
    [UIView commitAnimations]; 
} 

-(IBAction)PressedTeacherButton: (UIBarButtonItem*) Teacherbutton 
{ 
    [self setNameLabel: @"Mrs Hayward" Child:[NSNumber numberWithInt:0]]; 
    firstTable.hidden = TRUE; 
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(Revert)]; 
    [self animation]; 

    //Pass on admins name and also bool whether they are a child. 
} 

试图寻找解决方案，但找不到任何东西。感谢您的帮助：d

* UPDATE

范围缩小到[self setNameLabel: @"Mrs Hayward" Child:[NSNumber numberWithInt:0]];似乎动画不喜欢动画之前也没有改变后的标签。我已经尝试完成功能，它动画，然后立即重置到旧位置后更改标签。

请求由BOT忍受setnamelabel方法：

- (void) setNameLabel:(NSString *)sender Child:(NSNumber *)Child 
{ 
    self.childnamelabel.text = sender; 
    IsAChild = Child; 
} 

仍然无人应答:(

Answer 1

虽然你的代码看起来不错，我也有类似的问题，一段时间后，我切换到使用块，它。工作

尝试使用

-(void)animation 
{ 
    CGRect labelframe = childnamelabel.frame; 
    labelframe.origin.x = 335.5; // new x coordinate 
    labelframe.origin.y = 359; // new y coordinate 
    CGRect textframe = passwordfield.frame; 
    textframe.origin.x = 294; // new x coordinate 
    textframe.origin.y = 388; // new y coordinate 
    CGRect submitframe = submit.frame; 
    submitframe.origin.x = 480; // new x coordinate 
    submitframe.origin.y = 387; // new y coordinate 

    [UIView animateWithDuration:0.25 animations:^{ 
     childnamelabel.frame = labelframe; 
     passwordfield.frame = textframe; 
     submit.frame = submitframe; 
    }]; 
}