IOS 滚动字幕

//获取到最大滚动范围就可以启动滚动事件
-(void)setScrMaxW:(NSInteger)scrMaxW{
    _scrMaxW=scrMaxW;
    self.textScrollview.contentSize=CGSizeMake(scrMaxW, 0);
    [self addTimer];
}

- (void)timerClick
    self.scrX=self.scrX+1;
    [UIView animateWithDuration:0.1 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        [self.textScrollview setContentOffset:CGPointMake(self.scrX, 0) animated:NO];
    } completion:nil];
    //滚动到可滚动区域的一半时重置
    if (self.textScrollview.contentOffset.x+1>=self.textScrollview.contentSize.width/2) {
        self.scrX=0;
        [self.textScrollview setContentOffset:CGPointMake(self.scrX, 0) animated:NO];
    }else{
}

-(void)setTextArr:(NSMutableArray *)textArr{
    _textArr=textArr;
    self.txtLabel.text=textArr[0];
    self.scrollWidth=[self getTxtWidth:textArr[0]];
//    初始展示的字幕可以根据需求调整，放在最左边或者默认在屏幕右侧
    [self.textScrollview setContentOffset:CGPointMake(ViewAllWidth, 0) animated:NO];
//    初始展示文本下标
    self.arrNum=0;
    [self addTimer];
}

- (void)timerClick
    self.scrX=self.scrX+1;
    [UIView animateWithDuration:0.1 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        [self.textScrollview setContentOffset:CGPointMake(self.scrX, 0) animated:NO];
    } completion:nil];
    if (self.textScrollview.contentOffset.x>=self.textScrollview.contentSize.width-ViewAllWidth) {
        [self refreshTxt];
    }else{
-(void)refreshTxt{
    if (self.arrNum==self.textArr.count-1) {
        self.arrNum=0;
    }else{
        self.arrNum=self.arrNum+1;
    self.txtLabel.text=self.textArr[self.arrNum];
    self.scrollWidth=[self getTxtWidth:self.textArr[self.arrNum]];
    self.scrX=0;
    [self.textScrollview setContentOffset:CGPointMake(self.scrX, 0) animated:NO];
-(void)setScrollWidth:(CGFloat)scrollWidth{
    _scrollWidth=scrollWidth;
    self.textScrollview.contentSize=CGSizeMake(scrollWidth+ViewAllWidth*2, 0);
}

-(void)setSxArry:(NSMutableArray *)sxArry{
    _sxArry=sxArry;
    //将要显示的文本数量翻倍
    [_sxArry addObjectsFromArray:[NSArray arrayWithArray:sxArry]];
}

-(void)scrollTableveiwcell{
    __weak typeof(self)  weakSelf=self;
    //    整个滚动完一次，回到初始状态
    if (self.scrollSection==self.sxArry.count/2) {
        self.scrollSection=0;
        [self.fightTableView setContentOffset:CGPointMake(0, 0) animated:NO];
    }else{
    [UIView transitionWithView: self.fightTableView duration:0.3 options: UIViewAnimationOptionTransitionNone animations: ^{
        [weakSelf.fightTableView setContentOffset:CGPointMake(0, weakSelf.fightTableView.contentOffset.y+cellHeight) animated:YES];
    } completion: ^(BOOL finished) {
        weakSelf.scrollSection=weakSelf.scrollSection+1;
}

-(void)checkDataIndex{
    if (self.arrNum==self.sxArry.count-1) {
        self.arrNum=0;
    }else{
        self.arrNum=self.arrNum+1;
- (void)scrollTxtAction {
    [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        CATransition *transition = [CATransition animation];
        transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
        transition.type = kCATransitionPush;
        transition.subtype = kCATransitionFromTop;
        transition.delegate = self;
        [self.txtLabel.layer addAnimation:transition forKey:nil];
        [self checkDataIndex];
    } completion:^(BOOL finished) {
        self.txtLabel.text=self.sxArry[self.arrNum];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self scrollTxtAction];