用NSLog记录Log的代码

在XCode中 点 Run->Console可以查看NSLog的记录。

NSLog(@"log: %@ ", myString);
NSLog(@"log: %f ", myFloat);
NSLog(@"log: %i ", myInt);

NSLog() 寫到文件   

- (void) redirectConsoleLogToDocumentFolder {
     
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *logPath = [documentsDirectory stringByAppendingPathComponent:@"console_log.txt"];
    freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);
}
 
// 用得時候
- (void)applicationDidFinishLaunching:(UIApplication *)application {
     
    [self redirectConsoleLogToDocumentFolder];
}

然後在Xcode Organizer裡邊取出來