ios 將Log信息寫入文件

有時候我們爲了調試需要將一些信息寫入到文件，便於查看問題原因；

方式如下：

一、存儲

 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *logPath = [documentsDirectory stringByAppendingPathComponent:@"console.log"];
    freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);

二、讀取

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *logPath = [documentsDirectory stringByAppendingPathComponent:@"console.log"];
//寫入的內容
NSString *string = [[NSString alloc]initWithContentsOfFile:logPath encoding:NSUTF8StringEncoding error:nil];