我有处理同一张图片的动画
我在 UIView 上创建了一个 UILabel。我为 UILabel 制作了从右向左移动的动画。
我想要同样的:
这是我的代码:
[UIView animateKeyframesWithDuration:6 delay:0 options:UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionCurveEaseOut animations:^{
_lbAnimation.frame=CGRectMake(0-(rect.size.width), _lbAnimation.frame.origin.y, rect.size.width, _lbAnimation.frame.size.height);
} completion:^(BOOL finished)
{
_viewAnimation.hidden = YES;
}];
现在，我希望当 UILabel 的框架移动到末尾时是 UIView 的宽度:_viewAnimation 跟随 UILabel。
请帮帮我。
这是我的代码
https://github.com/nhhthuanck/Alert-Animation
请再次检查帮助我。
最佳答案
您不应该将 lbAnimation 放在 viewAnimation 中。并且需要一些计算动画时间的持续时间。
- (IBAction)startAction:(id)sender {
NSString * htmlString = @"<html>"
" <head>"
" <style type='text/css'>"
" body { font: 16pt 'Gill Sans'; color: #1a004b; }"
" i { color: #822; }"
" </style>"
" </head>"
" <body>Here is some <i>formatting!</i> <a href='#'><font color='green'>Google</font></a><font color='red'> example text</font><a href='#'>YouTube</a><b> bold</b> and <i>italic</i></body>"
"</html>";
NSError *err = nil;
NSAttributedString * attrStr = [[NSAttributedString alloc]
initWithData: [htmlString dataUsingEncoding:NSUTF8StringEncoding]
options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType }
documentAttributes: nil
error: &err];
_viewAnimation.frame = CGRectMake(self.view.frame.size.width, _viewAnimation.frame.origin.y, _viewAnimation.frame.size.width, _viewAnimation.frame.size.height);
_viewAnimation.hidden = NO;
_lbAnimation.hidden = YES;
CGRect rect = [attrStr boundingRectWithSize:CGSizeMake(FLT_MAX, _lbAnimation.frame.size.height)
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
_viewAnimation.frame=CGRectMake(0, _viewAnimation.frame.origin.y, _viewAnimation.frame.size.width, _viewAnimation.frame.size.height);
} completion:^(BOOL finished)
{
_lbAnimation.hidden = NO;
_lbAnimation.attributedText = attrStr;
_lbAnimation.frame = CGRectMake(self.view.frame.size.width, _lbAnimation.frame.origin.y, rect.size.width, _viewAnimation.frame.size.height);
CGFloat duration = 6;
CGFloat ratio = _viewAnimation.frame.size.width / (rect.size.width + _viewAnimation.frame.size.width);
[UIView animateWithDuration:duration * ratio delay:duration * (1-ratio) + 0.1f options:UIViewAnimationOptionCurveLinear animations:^{
_viewAnimation.frame = CGRectMake(_viewAnimation.frame.origin.x, _viewAnimation.frame.origin.y, 0, _viewAnimation.frame.size.height);
} completion:^(BOOL finished) {
_viewAnimation.hidden = YES;
}];
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
_lbAnimation.frame=CGRectMake(-rect.size.width, _lbAnimation.frame.origin.y, rect.size.width, _lbAnimation.frame.size.height);
} completion:^(BOOL finished)
{
}];
}];
}
可以查看my demo .
关于ios - UIView 中的动画遵循 UILabel，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47707301/