UIImage进行切割截取

UIImage *image = [UIImage imageNamed:@"111.png"];    

CGImageRef imgRef1 =image.CGImage;

    CGImageRef finalImgRef1 = CGImageCreateWithImageInRect(imgRef1,CGRectMake(0, 0, 80, 590));

    UIImage * image1 = [UIImage imageWithCGImage:finalImgRef1];

1. -(UIImage*)CropImage:(UIImage*)photoimage  
2. {      
3.     CGImageRef imgRef =photoimage.CGImage;  
4.     CGImageRef finalImgRef=CGImageCreateWithImageInRect(imgRef,CGRectMake(0, 0, 100, 1000);  
5.     return [UIImage imageWithCGImage:finalImgRef];  
6. }