iOS - 将Xcode控制台Log日志转为文本文件

1.在AppDelegate.m中创建函数实现以下代码块:

 #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 = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:@"NSLog.txt"];// 注意不是NSData!

NSString *logFilePath = [documentDirectory stringByAppendingPathComponent:fileName];
// 先删除已经存在的文件
NSFileManager *defaultManager = [NSFileManager defaultManager];
[defaultManager removeItemAtPath:logFilePath error:nil];

// 将log输入到文件
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);

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

}

2.然后在didFinishLaunchingWithOptions方法里面调用

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     [self  nslogToFile];
}