1、如果在程序中想对某张图片进行处理的话(得到某张图片的一部分)可一用以下代码:
UIImage *image = [UIImage imageNamed:filename];
CGImageRef imageRef = image.CGImage;
CGRect rect = CGRectMake(origin.x, origin.y ,size.width, size.height);
CGImageRef imageRefRect = CGImageCreateWithImageInRect(imageRef, rect);
UIImage *imageRect = [[UIImage alloc] initWithCGImage:imageRefRect];
2、判断设备是iphone还是iphone4的代码:
#define isRetina ([UIScreen instancesRespondToSelector:@selector(cur...