摘要：
UIImage *srcimg = [UIImage imageNamed:@"test.png"];／／／／test.png宽172 高192
NSLog(@"image width = %f,height = %f",srcimg.size.width,srcimg.size.height);
UIImageView *imgview = [[UIImageView alloc] init];
imgview.frame = CGRectMake(10, 150, 300, 220);
CGRect rect = CGRectMake(0, 0, 300, 100);／／要裁剪的图片区域，按照原图的像素大小来，超过原图大小的边自动适配
CGImageRef cgimg = CGImageCreateWithImageInRect([srcimg CGImage], rect);
imgview.image = [UIImage imageWithCGImage:cgimg];
CGImageRelease(cgimg);／／用完一定要释放，否则内存泄露
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