iOS UIImageView自适应图片大小

窗口大小获取：

CGRectscreenBounds = [ [UIScreenmainScreen]bounds];//返回的是带有状态栏的Rect

CGRect rect = [ [UIScreenmainScreen]applicationFrame];//不包含状态栏的Rect

UIImageView：

一 ：圆角以及自适应图片大小

UIImage* image = [UIImage imageNamed:@"image.png"];

UIImageView* imageView = [[[UIImageView alloc] initWithImage:image] autorelease];

imageView.frame = CGRectMake(0, 0, 300, 200);

imageView.layer.cornerRadius = 8;
imageView.layer.masksToBounds = YES;

//自适应图片宽高比例
imageView1.contentMode = UIViewContentModeScaleAspectFit;

 

二 图片自适应UIImageView (来源于:https://www.61ic.com/Mobile/iPhone/201103/29636.html)

- (UIImage*)rescaleImageToSize:(CGSize)size{

CGRectrect =CGRectMake(0.0,0.0,size.width,size.height);

UIGraphicsBeginImageContext(rect.size);

[selfdrawInRect:rect];// scales image to rect

UIImage*resImage =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnresImage;

}