ios裁剪圖片

UIImage *srcimg = [UIImage imageNamed:@"test.png"];／／／／test.png寬172 高192NSLog(@"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);／／要裁剪的圖片地區，按照原圖的像素大小來，超過原圖大小的邊自動適配CGImageRef cgimg = CGImageCreateWithImageInRect([srcimg CGImage], rect);imgview.image = [UIImage imageWithCGImage:cgimg];CGImageRelease(cgimg);／／用完一定要釋放，否則記憶體泄露[self.view addSubview:imgview];