前两天做项目，由于图片的大小比例与给定imageView的大小比例不一致，导致图片变形影响美观；现做以下操作
//根据宽高剪切图片
+(UIImage *)getImageFromUrl:(NSURL *)imgUrl imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height;
#pragma mark-------根据imgView的宽高获得图片的比例
+(UIImage *)getImageFromUrl:(NSURL *)imgUrl imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height{
UIImage * image =[[UIImage alloc] init];
UIImage * newImage = [image getImageFromUrl:imgUrl imgViewWidth:width imgViewHeight:height];
return newImage;
}
//对象方法
-(UIImage *)getImageFromUrl:(NSURL *)imgUrl imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height{
//data 转image
UIImage * image ;
//根据网址将图片转化成image
NSData * data = [NSData dataWithContentsOfURL:imgUrl];
image =[UIImage imageWithData:data];
//图片剪切
UIImage * newImage = [self cutImage:image imgViewWidth:width imgViewHeight:height];
return newImage;
}
//裁剪图片
- (UIImage *)cutImage:(UIImage*)image imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height
{
//压缩图片
CGSize newSize;
CGImageRef imageRef = nil;
if ((image.size.width / image.size.height) < (width / height)) {
newSize.width = image.size.width;
newSize.height = image.size.width * height /width;
imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
} else {
newSize.height = image.size.height;
newSize.width = image.size.height * width / height;
imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));
}
return [UIImage imageWithCGImage:imageRef];
}
