在老的iOS应用中,背景图片一般为320*480,在iphone5中会进行拉伸,特别是在背景图片和控件叠加使用的情况下,会造成控件位置和图片对应位置的偏移,那么我们只能通过提供320*568大小的图片来解决,但是ios6中不会识别-568h@2x后缀的图片。因此我们需要自己扩展UIImage方法,来实现系统自动识别a.png,a@2x.png ,a-568h@2x.png.

@implementation UIImage (iPhone5extension)
+ (UIImage*)imageNamedForDevice:(NSString*)name {

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
if (([UIScreen mainScreen].bounds.size.height * [UIScreen mainScreen].scale) >= 1136.0f)
//Check if is there a path extension or not
if (name.pathExtension.length) {
name = [name stringByReplacingOccurrencesOfString: [NSString stringWithFormat:@".%@", name.pathExtension]
withString: [NSString stringWithFormat:@"-568h@2x.%@", name.pathExtension ] ];

} else {
name = [name stringByAppendingString:@"-568h@2x"];

//load the image e.g from disk or cache
UIImage *image = [UIImage imageNamed: name ];
if (image) {
//strange Bug in iOS, the image name have a “@2x” but the scale isn’t 2.0f
return [UIImage imageWithCGImage: image.CGImage scale:2.0f orientation:image.imageOrientation];


return [UIImage imageNamed: name ];



使用的时候需要手动的去设置背景图片,而不能在Interface builder中去设置

self.imageView.image = [UIImage imageNamedForDevice:@”login.png”];

This entry was posted in iOS, iphone5.

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