建議圖像和文件上傳爲iOS開發的示例

Question

目前我正在做一個iOS應用程序，允許用戶上傳文件或圖像，但我沒有
想法如何開始。我需要某種在線服務器，可以讓我暫時保留
的上傳文件或圖像，並可以恢復。任何簡單的例子可以推薦？

Answer 1

您可以使用Base64上傳圖片。首先，您必須將Base64從here添加到您的項目中。我在這裏添加了一個示例代碼。

- (void) uploadImage { 

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mywebpage.com/upload.json"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:1000.0]; 

    NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
    NSString *path = [NSString stringWithFormat:@"%@/design%i.png", docDir, designNum]; 
    NSLog(@"%@",path); 

    NSData *imageData = UIImagePNGRepresentation([UIImage imageWithContentsOfFile:path]); 
    [Base64 initialize]; 
    NSString *imageString = [Base64 encode:imageData]; 

    NSUInteger length = [imageString length]; 
    NSUInteger chunkSize = 1000; 

    NSUInteger thisChunkSize = length - offset > chunkSize ? chunkSize : length - offset; 
    NSString *chunk = [imageString substringWithRange:NSMakeRange(offset, thisChunkSize)]; 
    offset += thisChunkSize; 

    NSArray *keys = [NSArray arrayWithObjects:@"design",@"design_id",@"fragment_id",nil]; 
    NSArray *objects = [NSArray arrayWithObjects:chunk,@"design_id",[NSString stringWithFormat:@"%i", chunkNum],nil]; 
    NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys]; 

    NSError *error; 
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:kNilOptions error:&error]; 

    [request setHTTPMethod:@"POST"]; 
    [request setValue:[NSString stringWithFormat:@"%d",[jsonData length]] forHTTPHeaderField:@"Content-Length"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; 
    [request setHTTPBody:jsonData]; 

    [self startAsyncLoad:request withTag:[NSString stringWithFormat:@"tag%i",chunkNum]]; 

    if (offset > length) { 
     stopSending = YES; 
    } 

} 

您也可以參考這個：

Convert between UIImage and Base64 string