ios 将Log資訊寫入檔案

有時候我們為了調試需要将一些資訊寫入到檔案，便于檢視問題原因；

方式如下：

一、存儲

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