最近在做APP的时候，遇到了难题：根据公司需求，在用户评论并上传图片的时候，有的手机像素比较高拍的照片高清的，但是每张图片占用的内存太大，或者上传照片的时候，相册的部分照片本身就占很大内存空间，后台数据库内存量有限，如果后期用户达到了几百万，每个用户都评论并上传这么高像素大内存的图片上去，后台数据库怕承受不了，继续拓展后台存储量的话，需要很大成本，那么怎么在前台来处理这些上传的图片而又不失大体呢？
这次总结得是用AFNetworking 向后台传输一张或多张图片，并且将照片压缩，感觉还是AFNetworking好使，相比原生的NSSURLsession的传输方法，话不多说，开始分享，用的话，代码基本不用改，直接用~（上传头像的时候，点击保存~触发这个）
上传单张图片：
↓↓↓
UIImage *image = [UIImage imageNamed:@"3"]; NSMutableDictionary *photo = [NSMutableDictionary dictionary]; [photo setObject:@"123" forKey:@"phoneNumber"]; [photo setObject:@"123" forKey:@"psw"]; NSLog(@"1111%@",photo); AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; manager.requestSerializer.timeoutInterval = 20; manager.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"text/plain",@"multipart/form-data"]]; [manager POST:@"http://192.168.0.105:8080/miracle/Upload.action" parameters:photo constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) { NSDate *date = [NSDate date]; NSDateFormatter *formormat = [[NSDateFormatter alloc]init]; [formormat setDateFormat:@"HHmmss"]; NSString *dateString = [formormat stringFromDate:date]; NSString *fileName = [NSString stringWithFormat:@"%@.png",dateString]; NSData *imageData = UIImageJPEGRepresentation(image, 1); double scaleNum = (double)300*1024/imageData.length; NSLog(@"图片压缩率：%f",scaleNum); if(scaleNum <1){ imageData = UIImageJPEGRepresentation(image, scaleNum); }else{ imageData = UIImageJPEGRepresentation(image, 0.1); } [formData appendPartWithFileData:imageData name:@"files" fileName:fileName mimeType:@"image/jpg/png/jpeg"]; } progress:^(NSProgress * _Nonnull uploadProgress) { NSLog(@"---%@",uploadProgress); } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { NSLog(@"`````````%@",responseObject); } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { }];
上传多张图片：
1 NSArray * _imageArr = @[@"1",@"2",@"3"];
2
3
4 AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
5 manager.requestSerializer.timeoutInterval = 20;
6 manager.responseSerializer.acceptableContentTypes = [NSSet setWithArray:@[@"text/plain",@"multipart/form-data"]];
7 [manager POST:@"http://192.168.0.105:8080/miracle/Upload.action" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> _Nonnull formData) {
8
9 for (int i=0; i<_imageArr.count; i++) {
10
11
12 UIImage * image =[UIImage imageNamed:_imageArr[i]];
13 NSDate *date = [NSDate date];
14 NSDateFormatter *formormat = [[NSDateFormatter alloc]init];
15 [formormat setDateFormat:@"HHmmss"];
16 NSString *dateString = [formormat stringFromDate:date];
17
18 NSString *fileName = [NSString stringWithFormat:@"%@.png",dateString];
19 NSData *imageData = UIImageJPEGRepresentation(image, 1);
20 double scaleNum = (double)300*1024/imageData.length;
21 NSLog(@"图片压缩率：%f",scaleNum);
22
23
24
25 if(scaleNum <1){
26
27 imageData = UIImageJPEGRepresentation(image, scaleNum);
28 }else{
29
30 imageData = UIImageJPEGRepresentation(image, 0.1);
31
32 }
33
34 [formData appendPartWithFileData:imageData name:@"files" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
35 }
36 } progress:^(NSProgress * _Nonnull uploadProgress) {
37
38 NSLog(@"---%@",uploadProgress);
39
40 } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
41
42 NSLog(@"`````````%@",responseObject);
43
44
45 } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
46
47
48 }];