文字上下滚动
项目中可能会用到单条数据需要上下滚动显示,下面是一个非常简单的封装Demo,可以根据自己的项目进行自定义修改。
效果如下:
效果图.gifDemo下载
项目代码
/** 数据 */
@property (nonatomic, copy) NSArray *dataArr;
/** 当前Label */
@property (nonatomic, strong) UILabel *currentLab;
/** 下一个label */
@property (nonatomic, strong) UILabel *nextLab;
/** 定时器 */
@property (nonatomic, strong) NSTimer *timer;
/** 当前下标 */
@property (nonatomic, assign) NSInteger currentIndex;
主要实现思路:通过两个Lab进行动画操作实现上下滚动再进行数据赋值操作
- (void)refreshData {
if (self.currentIndex == self.dataArr.count - 1) {
self.currentIndex = -1;
}
self.nextLab.text = self.dataArr[self.currentIndex + 1];
self.currentIndex ++;
}
- (void)rollLab {
[self refreshData];
__weak typeof(self) weakSelf = self;
[UIView animateWithDuration:0.5 animations:^{
weakSelf.currentLab.frame = CGRectMake(0, - 24, weakSelf.frame.size.width, 24);
weakSelf.nextLab.frame = CGRectMake(0, 0, weakSelf.frame.size.width, 24);
} completion:^(BOOL finished) {
weakSelf.currentLab.text = weakSelf.nextLab.text;
weakSelf.currentLab.frame = CGRectMake(0, 0, weakSelf.frame.size.width, 24);
weakSelf.nextLab.frame = CGRectMake(0, 24, weakSelf.frame.size.width, 24);
}];
}
可根据实际情况进行自定义界面操作,实现原理不变
GitHub地址 :https://github.com/qiuyubude/RollTextView
简书地址:https://www.jianshu.com/p/8744fd855eed
掘金地址:https://juejin.im/post/5de4d1d35188250f9c2472b4
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