ios將音頻和視頻url保存到文檔目錄

Question

我需要將所有音頻和視頻url保存到來自服務器的文檔目錄中。我已經嘗試了示例代碼

NSData *urlData = [NSData dataWithContentsOfURL:[NSURL URLWithString: "http://www.ebookfrenzy.com/ios_book/movie/movie.mp4"]]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *dataPath_ = [documentsDirectory stringByAppendingPathComponent:@"/MyFolder"]; 
NSString *newStr = [@"test" stringByAppendingString:[NSString stringWithFormat:@".mp4"]]; 
NSString *FilePath = [NSString stringWithFormat:@"%@/%@",dataPath_,newStr]; 
[urlData writeToFile:FilePath atomically:YES]; 

該文件夾中創建文件目錄，但視頻沒有保存到folder.Can任何人的幫助來排序了這一點。

Answer 1

你應該建立正確的路徑，你應該做一些基本的錯誤檢查：

NSData *urlData = [NSData dataWithContentsOfURL:[NSURL URLWithString: @"http://www.ebookfrenzy.com/ios_book/movie/movie.mp4"]]; 
if (urlData) { 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"MyFolder"]; 
    // Create folder if needed 
    [[NSFileManager defaultFileManager] createDirectoryAtPath:dataPath withIntermediateDirectories:YES attributes:nil error:nil]; 

    NSString *filePath = [dataPath stringByAppendingPathComponent:@"test.mp4"]; 
    if ([urlData writeToFile:filePath atomically:YES]) { 
     // yeah - file written 
    } else { 
     // oops - file not written 
    } 
} else { 
    // oops - couldn't get data 
}