NSURLConnection didSendBodyData进度 [英] NSURLConnection didSendBodyData progress

问题描述

我正在使用POST请求将一些数据上传到服务器，并且尝试基于NSURLConnection的didSendBodyData方法的totalBytesWritten属性更新UIProgressView的进度.使用下面的代码，我无法正确更新进度视图，直到完成，它始终为0.000.我不确定要乘以或除以什么来获得更好的上传进度.

I'm using a POST request to upload some data to a server, and I'm trying to update the UIProgressView's progress based on the totalBytesWritten property of the didSendBodyData method of NSURLConnection. Using the below code, I don't get a proper updating of the progress view, it's always 0.000 until it finishes. I'm not sure what to multiply or divide by to get a better progress of the upload.

我将不胜感激！代码:

- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
{
    NSNumber *progress = [NSNumber numberWithFloat:(totalBytesWritten / totalBytesExpectedToWrite)];

    NSLog(@"Proggy: %f",progress.floatValue);

    self.uploadProgressView.progress = progress.floatValue;
}

推荐答案

您必须将bytesWritten和bytesExpected转换为float值以进行除法.

You have to cast the bytesWritten and the bytesExpected as float values to divide.

float myProgress = (float)totalBytesWritten / (float)totalBytesExpectedToWrite;
progressView.progress = myProgress;

否则，除以2的整数将得到0或其他数字.

Otherwise you are will get either a 0 or some other number as a result of dividing 2 integers.

即:10 / 25 = 0

10.0 / 25.0 = 0.40

Objective-C提供了modulus运算符%来确定余数，对于除以整数非常有用.

Objective-C provides the modulus operator % for determining remainder and is useful for dividing integers.

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