- (void)viewDidLoad {    [super viewDidLoad];    　　//數據源    self.messageArray = [NSArray arrayWithObjects:                         @"1",                         @"2",                         @"3",                         nil];    self.msgCount = 0;//從第一條開始顯示}

-(void)viewDidAppear:(BOOL)animated {    //播放第一條并加入Timer設定切換間隔時間    [self msgChange];    [NSTimer scheduledTimerWithTimeInterval:5.0f target:self selector:@selector(msgChange) userInfo:nil repeats:YES];}

- (void)msgChange {    if (self.msgCount < self.messageArray.count) {        self.scrollLabel.text = [self.messageArray objectAtIndex:self.msgCount];        self.msgCount++;    } else {        self.scrollLabel.text = @"no message";//此處刪除可以改為循環滾動播放    }        [self.scrollLabel sizeToFit];    CGRect frame = self.scrollLabel.frame;    frame.origin.x = [UIScreen mainScreen].bounds.size.width;    self.scrollLabel.frame = frame;        [UIView beginAnimations:@"scrollLabelTest" context:NULL];    [UIView setAnimationDuration:5.0f];    [UIView setAnimationCurve:UIViewAnimationCurveLinear];    [UIView setAnimationDelegate:self];    [UIView setAnimationRepeatAutoreverses:NO];    [UIView setAnimationRepeatCount:0];        frame = self.scrollLabel.frame;    frame.origin.x = -frame.size.width;    self.scrollLabel.frame = frame;    [UIView commitAnimations];}