#pragma mark - 自定义方法,将nslog的输出信息写入到dr.log文件中

- (void)nslogToFile

{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString*documentDirectory = [pathsobjectAtIndex:0];

NSString*fileName = [NSStringstringWithFormat:@"NSLog.txt"];// 注意不是NSData!

NSString*logFilePath = [documentDirectorystringByAppendingPathComponent:fileName];

// 先删除已经存在的文件

NSFileManager *defaultManager = [NSFileManager defaultManager];

[defaultManagerremoveItemAtPath:logFilePatherror:nil];

// 将log输入到文件

freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);

freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);

}

在application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions中调用；

- (BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NSDictionary*)launchOptions {

    // Override point for customization after application launch.

    [self  nslogToFile];

    return YES;

}