ios - UILabel 为宽度设置动画

Question

我们如何对UILabel' 的宽度进行动画处理，以便仅使用UIView animateWithDuration

感谢您的帮助（此时我很沮丧，因为我一直在尝试这样做，但它不起作用）

Answer 1

您可以设置UILabelUIView 动画块内部的框架。像这样的东西：

CGRect originalFrame = self.address.frame;

[UIView animateWithDuration:0.3
                 animations:^{
    self.myLabel.frame = CGRectMake(0, 0, 100, 100);
}
                 completion:^(BOOL finished) {
                     // use similar UIView animation to resize back to original
                 }];

显然，您输入的尺寸将取决于您的应用程序，并且可能会根据内容进行计算。

Answer 2

终于在 iOS 5.0 中用积木做到了这一点

        [UIView animateWithDuration:2. delay:0 options:UIViewAnimationOptionAutoreverse|UIViewAnimationOptionBeginFromCurrentState  animations:^{
            [self.messageLabel setFrame:CGRectMake(90, 0, labelSize.width, 90)];

        } completion:^(BOOL finished) {

        }];

Answer 3

我能够以这种方式做到这一点。self 指的是我在其中添加标签的视图。在初始化中，添加宽度为 1 px 的标签。然后使用下面的.. UIViewAnimationOptionBeginFromCurrentState 允许它像门一样打开 PHEW！

    [UIView animateWithDuration:1. delay:0 options:UIViewAnimationOptionBeginFromCurrentState  animations:^{
        [self setFrame:CGRectMake(self.frame.origin.x-labelSize.width-PADDING, self.frame.origin.y, self.frame.size.width+labelSize.width+PADDING, self.frame.size.height)];
        [self.messageLabel setFrame:CGRectMake(95, 10, labelSize.width, labelSize.height)];
        self.messageLabel.alpha = 1; 
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:1. delay:2. options:0  animations:^{
            self.messageLabel.alpha = 0;  
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:1. delay:0. options:0  animations:^{
                [self setFrame:CGRectMake(self.frame.origin.x+labelSize.width+PADDING, self.frame.origin.y, self.frame.size.width-labelSize.width-PADDING, self.frame.size.height)];
            } completion:^(BOOL finished) {
            }];
        }];
    }];

Answer 4

尝试使用如下动画增加和减少帧宽度

    // original label frame CGRectMake( 0,0, 100,60 );
    [UIView beginAnimations: @"moveLogo" context: nil]; 
    [UIView setAnimationDelegate:self]; 
    [UIView setAnimationDuration:1.0];
    [UIView setAnimationCurve: UIViewAnimationCurveLinear];
    [UIView setAnimationRepeatAutoreverses:YES];
    [UIView setAnimationRepeatCount:4];
    //increasing frame width
    label.frame =  CGRectMake( 0,0, 400,60 );   
    [UIView commitAnimations];

Answer 5

尝试这个

 [UIView animateWithDuration:0.6 animations:^(void)
  {
     self.label.bounds = CGRectMake(100, 100, 200, 100); 

 }completion:^(BOOL finished) {

     [UIView animateWithDuration:0.6 animations:^(void)
     {
         self.label.bounds = CGRectMake(100, 100, 100, 100); 
     }];

 }];