iOS图片压缩及上传

1、在工具类定义压缩图片的方法,传入图片和所要压缩的尺寸

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+(UIImage *)imageWithImage:(UIImage *)image scaleToSize :(CGSize )newSize{

UIGraphicsBeginImageContext(newSize);

[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return newImage;

}

2、利用AFNetworking做图片上传功能

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+(void)POSTToUrl:(NSString *)url WithData:(NSData *)data
  WithReturnBlock:(ReturnValueBlock)block        
  WithErrorCodeBlock:(ErrorCodeBlock)errorBlock      
  WithFailtureBlock:(FailureBlock)failtureBlock{

  AFHTTPRequestOperationManager* manager = [[AFHTTPRequestOperationManager alloc]init];

  manager.requestSerializer = [AFHTTPRequestSerializer serializer];
  manager.responseSerializer = [AFJSONResponseSerializer serializer];     
  
  //不设置可能会出现404的bug
  manager.responseSerializer.acceptableContentTypes =       [manager.responseSerializer.acceptableContentTypes   setByAddingObject:@"text/html"];
  
  [manager POST:url parameters:nil
  constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
      //以上传的时间为图片名
      NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
      formatter.dateFormat = @"yyyyMMddHHmmss";
          NSString *str = [formatter stringFromDate:[NSDate date]];
      NSString *fileName = [NSString stringWithFormat:@"%@.png", str];
      
          [formData appendPartWithFileData:data
          name:@"upload" //upload.php处理文件的字段
          fileName:fileName //图片名字 
          mimeType:@"image/png"];
          
  }success:^(AFHTTPRequestOperation *operation,id responseObject) {
      //上传成功
  }failure:^(AFHTTPRequestOperation *operation,NSError *error) {
      //上传失败
  }
}

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