_imaegView= [[UIImageViewalloc]initWithFrame:[UIScreenmainScreen].bounds];
self.imaegView.image= [selfgetImage];
self.imaegView.alpha=0.5;
[self.viewaddSubview:self.imaegView];
- (UIImage*)getImage {
UIImage*images = [UIImageimageNamed:@"图片"];
UIGraphicsBeginImageContextWithOptions([UIScreenmainScreen].bounds.size,NO,1);
CGContextRefref =UIGraphicsGetCurrentContext();
[imagesdrawInRect:[UIScreenmainScreen].bounds];
CGContextAddEllipseInRect(ref,CGRectMake(50,100,200,200));
CGContextSetBlendMode(ref,kCGBlendModeClear);
CGContextFillPath(ref);
UIImage*image =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimage;
}
