Objective-C 基本 function

NSError *error;
    NSString* content = [NSString stringWithContentsOfFile:filename
                                                  encoding:NSUTF8StringEncoding
                                                     error:&error];
    if(error) {
        NSLog(@"error = %@", error);
    }

//存资料
[[NSUserDefaults standardUserDefaults]
          setObject:[NSString stringWithFormat:@"test"] forKey:@"score"];
 
//同步
[[NSUserDefaults standardUserDefaults] synchronize];
        
//取资料
        NSString *score = [[NSUserDefaults standardUserDefaults]
                               stringForKey:@"score"];
        NSLog(@"score = %@",score);

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

[NSTimer scheduledTimerWithTimeInterval:1.0
                                     target:self
                                   selector:@selector(setTime)
                                   userInfo:nil
                                    repeats:YES];

NSString *name = @"Michael Jordan";
NSLog(@"%@", name);
AVSpeechUtterance *utterance = [AVSpeechUtterance
                                speechUtteranceWithString:name];
AVSpeechSynthesizer *synth = [[AVSpeechSynthesizer alloc] init];
[synth speakUtterance:utterance];