写在艰苦的日子里。git
Github源码地址:github.com/JonHory/Tra…github
经过modal进行转场,设置modalTransitionStyle
为UIModalTransitionStyleCrossDissolve
,设置modalPresentationStyle
为UIModalPresentationOverFullScreen
api
外部只须要传入一个外部的UIImageView
便可
1.建立一个UIImageView
和一个CGRect
来保存图片信息和图片frame信息。
使用- (CGRect)convertRect:(CGRect)rect toView:(nullable UIView *)view;
方法来获取图片的相对位置。
2.视图将要出现时作动画效果app
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[UIView animateWithDuration:AnimationTime animations:^{
//这里能够自由发挥了
self.view.backgroundColor = [UIColor greenColor];self.currentIV.frame = CGRectMake(0, 0, 200, 200); self.currentIV.center = CGPointMake(self.view.center.x, 200);
} completion:^(BOOL finished) {
}];
}复制代码
3.返回的点击事件处理动画
- (void)back{
[UIView animateWithDuration:AnimationTime animations:^{
if ([self.type isEqualToString:@"vv"]) {
self.view.center = CGPointMake(self.view.center.x, self.view.bounds.size.height*1.5);
}else {
self.currentIV.frame = self.oldFrame;
self.view.backgroundColor = [UIColor clearColor];
}
} completion:^(BOOL finished) {
[self dismissViewControllerAnimated:NO completion:nil];
}];
}复制代码
4.就这样,效果就出来啦spa
用的是截屏的方法来实现背景缩小后置的效果
1.在当前UIViewController
用一个UIImageView
来保存截图code
-(UIImage *)screenImageWithSize:(CGSize )imgSize{
UIGraphicsBeginImageContext(imgSize);
CGContextRef context = UIGraphicsGetCurrentContext();
AppDelegate * app = (AppDelegate *)[UIApplication sharedApplication].delegate; //获取app的appdelegate,便于取到当前的window用来截屏
[app.window.layer renderInContext:context];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}复制代码
2.在下一个VC建立一个减方法,在当前VC中使用cdn
[self presentViewController:vc animated:NO completion:nil];
[UIView animateWithDuration:0.3 animations:^{
//当前VC下截图的缩小效果
self.screenshot.bounds = CGRectMake(50, 50, SCREEN.width - 100, SCREEN.height - 100);
} completion:^(BOOL finished) {
//这就是减方法 =_= 动画结束时,改变背景块的frame
[vc changeBigView];
}];复制代码
3.在下一个VC返回时,当前VC的截图视图移除。blog
[weakSelf.screenshot removeFromSuperview];复制代码
4.这样,BOSS直聘的动画效果就出现了。事件