从中心调整UILabel的大小? [英] Animate UILabel resizing from center?

问题描述

我想从中心调整标签大小并为该过程设置动画.但是，我可以使用的唯一选项是CGAffineTransformMakeScale和相应CALayer的默认锚点.

[UIView animateWithDuration:0.5 animations:^{
    self.title.transform = CGAffineTransformMakeScale(2.0,1.0);
}];

但是它压缩了里面的文字.我考虑过 answer ，看来问题已在Swift中解决了. /p>

但是，我不能只修改frame的size部分.如何在Obj C中解决这个问题?

解决方案

这将为您工作.您只需要给出宽度和高度的比例即可(默认为1，这将无效).这将为视图的框架设置动画，并将其设置回原始视图.

[UIView animateWithDuration:0.5
                  delay:0
                options:UIViewAnimationOptionBeginFromCurrentState
             animations:(void (^)(void)) ^{
                 self.textLabel.transform=CGAffineTransformMakeScale(3, 1);
             }
             completion:^(BOOL finished){
                 self.textLabel.transform=CGAffineTransformIdentity;
             }];

如果您不想恢复效果，可以这样做

[UIView animateWithDuration:0.5
                  delay:0
                options:UIViewAnimationOptionBeginFromCurrentState
             animations:(void (^)(void)) ^{
                 self.textLabel.transform=CGAffineTransformMakeScale(3, 1);
             }
             completion:nil];

I want to resize my label from center and animate that process. However, the only option I can use there is CGAffineTransformMakeScale with default anchor point of corresponding CALayer.

[UIView animateWithDuration:0.5 animations:^{
    self.title.transform = CGAffineTransformMakeScale(2.0,1.0);
}];

But it squished the text inside. I considered this answer and it looks like the problem is solved in Swift.

However, I can't modify only size part of the frame. How to approach this in Obj C?

解决方案

This will work for you. You just need to give scale for width and height (default 1, which will have no effect). And this will animate your view's frame and set it back to the original.

[UIView animateWithDuration:0.5
                  delay:0
                options:UIViewAnimationOptionBeginFromCurrentState
             animations:(void (^)(void)) ^{
                 self.textLabel.transform=CGAffineTransformMakeScale(3, 1);
             }
             completion:^(BOOL finished){
                 self.textLabel.transform=CGAffineTransformIdentity;
             }];

If you dont want revert effect than you can do like this

[UIView animateWithDuration:0.5
                  delay:0
                options:UIViewAnimationOptionBeginFromCurrentState
             animations:(void (^)(void)) ^{
                 self.textLabel.transform=CGAffineTransformMakeScale(3, 1);
             }
             completion:nil];

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