图片上传是每个项目中必不可少的一部分.而上传的时候如果不压缩的话,会对服务器造成较大的压力.也会有不好的用户体验.下面就和大家分享一下我自己用到的图片压缩与上传的方法.
1.项目要求要等图片比例压缩到1240*760以内
CGSize targetSize = image.size;
while (targetSize.width > 1240 && targetSize.height > 760) {
targetSize.width = targetSize.width / 2;
targetSize.height = targetSize.height / 2;
}
UIImage *newImage = [self imageCompressForSize:image targetSize:targetSize];
NSData *imageData = UIImageJPEGRepresentation(newImage, 0.1);
2.等比例压缩图片方法
#pragma mark 等比例压缩图片
-(UIImage *) imageCompressForSize:(UIImage *)sourceImage targetSize:(CGSize)size{
UIImage *newImage = nil;
CGSize imageSize = sourceImage.size;
CGFloat width = imageSize.width;
CGFloat height = imageSize.height;
CGFloat targetWidth = size.width;
CGFloat targetHeight = size.height;
CGFloat scaleFactor = 0.0;
CGFloat scaledWidth = targetWidth;
CGFloat scaledHeight = targetHeight;
CGPoint thumbnailPoint = CGPointMake(0.0, 0.0);
if(CGSizeEqualToSize(imageSize, size) == NO){
CGFloat widthFactor = targetWidth / width;
CGFloat heightFactor = targetHeight / height;
if(widthFactor > heightFactor){
scaleFactor = widthFactor;
}
else{
scaleFactor = heightFactor;
}
scaledWidth = width * scaleFactor;
scaledHeight = height * scaleFactor;
if(widthFactor > heightFactor){
thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;
}else if(widthFactor < heightFactor){
thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;
}
}
UIGraphicsBeginImageContext(size);
CGRect thumbnailRect = CGRectZero;
thumbnailRect.origin = thumbnailPoint;
thumbnailRect.size.width = scaledWidth;
thumbnailRect.size.height = scaledHeight;
[sourceImage drawInRect:thumbnailRect];
newImage = UIGraphicsGetImageFromCurrentImageContext();
if(newImage == nil){
NSLog(@"scale image fail");
}
UIGraphicsEndImageContext();
return newImage;
}
3.上传,用到AFNetworking(其中fileData传的就是图片数据)
#pragma mark 上传图片
+(void)uploadFileByString:(NSString *)urlString BodyDic:(NSDictionary *)bodyDic FileData:(NSData *)fileData FileName:(NSString *)fileName WithDataBlock:(void(^)(id data))dataBlock
{
//1.字符串的转码
urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:urlString]];
//2.创建管理者对象(session)
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
//3.设置允许请求的类别
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/plain",@"text/json",@"application/json",@"text/javascript",@"text/html", @"application/javascript", @"text/js", nil];
[manager POST:urlString parameters:bodyDic constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {
// [formData appendPartWithFormData:fileData name:fileName];
[formData appendPartWithFileData:fileData name:fileName fileName:@"image2.jpg" mimeType:@"image/jpeg"];
} progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
NSLog(@"上传成功");
dataBlock(responseObject);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
NSLog(@"上传失败");
}];
}
写的不好,大家凑合看哈.欢迎提建议
