iOS图片的压缩与上传 iOS图片的压缩与上传

【iOS图片的压缩与上传】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 = https://www.it610.com/article/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_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