iOS开发之上传头像详细步骤

上传头像在APP开发中是个很常见的功能，也不难，但是对于没有接触过的小伙伴还是有点坑的，不过只要稍微弄明白了 各个参数的意思就很简单了。直接贴出来代码，简单粗暴。

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1 首先因为要用到imagePicker，所以需要先遵守协议

<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

2 给头像的ImageView添加个tap手势

这个要记得开userInteractionEnabled，要不点了也没反应

    //头像
    UITapGestureRecognizer *changeUserIconTap =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeUserIconAction:)];
    [_user_iconImageView addGestureRecognizer:changeUserIconTap];

2 tap事件里面

//更换头像
- (void)changeUserIconAction:(UITapGestureRecognizer *)tap{
    //底部弹出来个actionSheet来选择拍照或者相册选择
    UIAlertController *userIconActionSheet = [UIAlertController alertControllerWithTitle:@"请选择上传类型" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    //相册选择
    UIAlertAction *albumAction = [UIAlertAction actionWithTitle:@"手机相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        WKLog(@"相册选择");
        //这里加一个判断，是否是来自图片库
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){
            UIImagePickerController * imagePicker = [[UIImagePickerController alloc]init];
            imagePicker.delegate = self;            //协议
            imagePicker.allowsEditing = YES;
            imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            [self presentViewController:imagePicker animated:YES completion:nil];
        }
    }];
    //系统相机拍照
    UIAlertAction *photoAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        WKLog(@"相机选择");
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
               UIImagePickerController * imagePicker = [[UIImagePickerController alloc]init];
            imagePicker.delegate = self;
            imagePicker.allowsEditing = YES;
            imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            [self presentViewController:imagePicker animated:YES completion:nil];
        }
    }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        //取消
        WKLog(@"取消");
    }];
    [userIconActionSheet addAction:albumAction];
    [userIconActionSheet addAction:photoAction];
    [userIconActionSheet addAction:cancelAction];
    [self presentViewController:userIconActionSheet animated:YES completion:nil];
}

代理方法

#pragma mark 调用系统相册及拍照功能实现方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage];//获取到所选择的照片
    _user_iconImageView.image = img;
    UIImage *compressImg = [self imageWithImageSimple:img scaledToSize:CGSizeMake(60, 60)];//对选取的图片进行大小上的压缩
    [self transportImgToServerWithImg:compressImg]; //将裁剪后的图片上传至服务器
    [self dismissViewControllerAnimated:YES completion:nil];

}

//用户取消选取时调用,可以用来做一些事情
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [picker dismissViewControllerAnimated:YES completion:nil];
}

图片裁剪压缩方法

//压缩图片方法
- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize{
    UIGraphicsBeginImageContext(newSize);
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

上传到服务器

//上传图片至服务器后台
- (void)transportImgToServerWithImg:(UIImage *)img{
    NSData *imageData;
    NSString *mimetype;
  //判断下图片是什么格式
    if (UIImagePNGRepresentation(img) != nil) {
        mimetype = @"image/png";
        imageData = UIImagePNGRepresentation(img);
    }else{
        mimetype = @"image/jpeg";
        imageData = UIImageJPEGRepresentation(img, 1.0);
    }
    NSString *urlString = @"http:///XXXXXX";
    NSDictionary *params = @{@"login_token":@"220"};
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager POST:urlString parameters:paramsconstructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        NSString *str = @"avatar";
        NSString *fileName = [[NSString alloc] init];
        if (UIImagePNGRepresentation(img) != nil) {
            fileName = [NSString stringWithFormat:@"%@.png", str];
        }else{
            fileName = [NSString stringWithFormat:@"%@.jpg", str];
        }
        // 上传图片，以文件流的格式
        /**
         *filedata : 图片的data
         *name     : 后台的提供的字段
         *mimeType : 类型
         */
        [formData appendPartWithFileData:imageData name:str fileName:fileName mimeType:mimetype];
    } progress:NULL success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //打印看下返回的是什么东西
        WKLog(@"上传凭证成功:%@",responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        WKLog(@"上传图片失败，失败原因是:%@", error);
    }];
}

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需要注意的一些东西:

1.一定记得在info.plist里面 写获取 相册，相机权限的字段，要不会崩的。
2.拍照只能在真机上试。
3.上传的时候，参数可以加密，但是加密后data可能有变化，这个就需要自己看着办了。。。