修改单张图片上传到服务器

#pragma mark - changeUserPhoto
- (void)changeUserPhoto {
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消"
                                               destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"从手机相册选择", nil];
    actionSheet.tag = 120;
   
    [actionSheet showInView:self.view];
}

#pragma mark - actionSheet
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (actionSheet.tag == 120) {
        if (buttonIndex == 0) //拍照
        {
            [self takePhoto];
        }
        else if (buttonIndex == 1) //打开本地相册
        {
            [self openLocalPhoto];
        }
    }
}

#pragma mark - TakePhoto
/**
 *  开始拍照
 */
- (void)takePhoto
{
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
   
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsEditing = YES;
        picker.sourceType = sourceType;
        [self presentViewController:picker animated:YES completion:nil];
    } else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                        message:@"抱歉，你的设备不支持该功能！"
                                                       delegate:self
                                              cancelButtonTitle:@"确定"
                                              otherButtonTitles:nil];
        [alert show];
        return;
    }
}

#pragma mark - openLibrary
// 打开本地相册

- (void)openLocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate  = self;
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:nil];
}

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info
{
        NSString *strType = [info objectForKey:UIImagePickerControllerMediaType];
        if ([strType isEqualToString:@"public.image"]) //当选择的类型是图片
        {
            UIImage *image = [info objectForKey:@"UIImagePickerControllerEditedImage"]; //先把图片转成NSData
            NSLog(@"image = %@", image);
            [reader dismissViewControllerAnimated:YES completion:nil]; //关闭相册界面
            //压缩图片
            UIImage *scalImage = [self scaleFromImage:image];
            imageView.image = scalImage;
            //保存到本地
          NSString *strfileName = [self saveImage:scalImage];
            //上传头像
            NSString *strUrl = [NSString stringWithFormat:@"%@", @"http://192.168.1.108:8080/resources/user/"];
            strUrl = [strUrl stringByAppendingString:@"headimg/"];
            strUrl = [strUrl stringByAppendingString:@"13061622013"];
            NSURL *url = [NSURL URLWithString:strUrl];
            ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
            [request setDelegate:self];
           
            [request addRequestHeader:@"Content-Type" value:@"application/json; encoding=utf-8"];
            [request addRequestHeader:@"Accept" value:@"application/json"];
            [request setFile:strfileName forKey:@"headImg"];
            [request setRequestMethod:@"POST"];
           
            [request setDidFailSelector:@selector(ASIFormDataRequestFailed:)];
            [request setDidFinishSelector:@selector(ASIFormDataRequestSuceed:)];
            [request startAsynchronous];

}
}
#pragma mark - savaImage// 保存图像
- (NSString *)saveImage:(UIImage*)image
{
    NSData *data;
   
    if (UIImagePNGRepresentation(image) == nil)
    {
        data = UIImageJPEGRepresentation(image, 1.0);
    }
    else
    {
        data = UIImagePNGRepresentation(image);
    }
   
    NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];
    NSString *filePath = [docPath stringByAppendingPathComponent:@"tianImage.png"];
    BOOL result = [data writeToFile:filePath atomically:YES];
    if (result) {
        NSLog(@"写入成功");
    }
    return filePath;
}#pragma mark - scalePhoto// 图像压缩
- (UIImage *)scaleFromImage:(UIImage *)image
{
    if (!image)
    {
        return nil;
    }
   
    NSData *data = UIImagePNGRepresentation(image);
    CGFloat dataSize = data.length/1024;
    CGFloat width  = image.size.width;
    CGFloat height = image.size.height;
    CGSize size;
   
    if (dataSize<=50) //小于50k
    {
        return image;
    }
    else if (dataSize<=100) //小于100k
    {
        size = CGSizeMake(width/2.f, height/2.f);
    }
    else if (dataSize<=200) //小于200k
    {
        size = CGSizeMake(width/4.f, height/4.f);
    }
    else if (dataSize<=500) //小于500k
    {
        size = CGSizeMake(width/4.f, height/4.f);
    }
    else if (dataSize<=1000) //小于1M
    {
        size = CGSizeMake(width/6.f, height/6.f);
    }
    else if (dataSize<=2000) //小于2M
    {
        size = CGSizeMake(width/10.f, height/10.f);
    }
    else //大于2M
    {
        size = CGSizeMake(width/12.f, height/12.f);
    }
   
    UIGraphicsBeginImageContext(size);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    if (!newImage)
    {
        return image;
    }
    return newImage;
}

#pragma mark - ASIHTTPRequestDelegate
- (void)ASIFormDataRequestSuceed:(ASIFormDataRequest *)request
{
   
}

- (void)ASIFormDataRequestFailed:(ASIFormDataRequest *)request
{
    NSError *error = [request error];
    NSLog(@"error:%@",error);

}