增加和减小UILabel文本大小的动画

Question

我想在UILabel文本上应用动画。我写了代码来增加动画块中的字体大小，但动画没有应用。

[UIView beginAnimations:nil context:nil/*contextPoint*/];
    monthsOnBoard.font=[UIFont fontWithName:@"digital-7" size:150];
    daysOnBoard.font=[UIFont fontWithName:@"digital-7" size:150];
    hoursOnBoard.font=[UIFont fontWithName:@"digital-7" size:100];
    minutesOnBoard.font=[UIFont fontWithName:@"digital-7" size:100];
    secondsOnBoard.font=[UIFont fontWithName:@"digital-7" size:100];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDelay:0.5];
    [UIView setAnimationDuration:1];
    [UIView setAnimationRepeatCount:4];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView commitAnimations];

Answer 1

UIView的字体不是可设置动画的属性。您应该改用转换。

[UIView beginAnimations:nil context:nil/*contextPoint*/];
monthsOnBoard.transform = CGAffineTransformMakeScale(2.0, 2.0); //increase the size by 2
 //etc etc same procedure for the other labels.
[UIView setAnimationDelegate:self];
[UIView setAnimationDelay:0.5];
[UIView setAnimationDuration:1];
[UIView setAnimationRepeatCount:4];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView commitAnimations];

类似地，您可以使用CGAffineTransformMakeScale(x, y);中的值-x是水平刻度常数，y是垂直刻度常数。享受吧！！

Answer 2

它可能会对你有所帮助

 monthsOnBoard.transform = CGAffineTransformScale(monthsOnBoard.transform, 1, 1); 
    [UIView beginAnimations:nil context:nil/*contextPoint*/];
    monthsOnBoard.transform = CGAffineTransformScale(monthsOnBoard.transform, 4, 4); 
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDelay:0.5];
    [UIView setAnimationDuration:1];
    [UIView setAnimationRepeatCount:4];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView commitAnimations];