利用定时器（NSTimer）和 UIScrollView 循环展示文本
即粘即用，效果如下图（不会截动图），但是一定会动（礼貌而又不失尴尬的微笑）
你仅需要复制下面的代码后，初始化LotteryScrollView和arrData。
并且调用以下两个方法
-(void)initView;
-(void)shutdown;//退出页面时，一定要调用这个方法，不然定时器不会自动自动释放。
新建LotteryScrollView.h文件，代码如下
#import@interface LotteryScrollView : UIView{
NSTimer *timer;
UIScrollView *scrollViewText;
}
@property (nonatomic ,strong) NSArray *arrData;
-(void)initView;
-(void)shutdown;
@end
新建LotteryScrollView.m文件，代码如下
#import "LotteryScrollView.h"
@implementation LotteryScrollView
#pragma mark - Class define variable
#define K_MAIN_VIEW_SCROLL_HEIGHT 80.0f
#define K_MAIN_VIEW_SCROLL_TEXT_TAG 300
#define K_MAIN_VIEW_TEME_INTERVAL 0.35 //计时器间隔时间(单位秒)
#define K_MAIN_VIEW_SCROLLER_SPACE 20 //每次移动的距离
#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH 300 //字体宽度
#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20 //前后间隔距离
-(id)initWithFrame:(CGRect)frame
array:(NSArray*)array{
self = [super initWithFrame:frame];
self.arrData = array;
return self;
}
//初始化数据
-(void) initView{
//文字滚动
[self initScrollText];
}
//文字滚动初始化
-(void) initScrollText{
//获取滚动条
scrollViewText = (UIScrollView *)[self viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG];
if(!scrollViewText){
scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 30, self.frame.size.width, 160)];
scrollViewText.showsHorizontalScrollIndicator = NO; //隐藏水平滚动条
scrollViewText.showsVerticalScrollIndicator = NO; //隐藏垂直滚动条
scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG;
scrollViewText.userInteractionEnabled = NO;
[scrollViewText setBackgroundColor:[UIColor clearColor]];
//清除子控件
for (UIView *view in [scrollViewText subviews]) {
[view removeFromSuperview];
}
//添加到当前视图
[self addSubview:scrollViewText];
}
if (self.arrData) {
CGFloat offsety = 0 ,i = 0, h = 30;
//设置滚动文字
UILabel *labText = nil;
for (NSString *dicTemp in self.arrData) {
labText = [[UILabel alloc] initWithFrame:CGRectMake(
(K_MAIN_VIEW_SCROLLER_LABLE_WIDTH + K_MAIN_VIEW_SCROLLER_LABLE_MARGIN),
(K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2+i*h,
K_MAIN_VIEW_SCROLLER_LABLE_WIDTH,
h)];
[labText setFont:[UIFont systemFontOfSize:15]];
[labText setTextColor:[UIColor blackColor]];
[labText setText:dicTemp];
offsety = labText.frame.origin.y;
//添加到滚动视图
[scrollViewText addSubview:labText];
i++;
}
//开启滚动
[self startScroll];
//设置滚动区域大小
[scrollViewText setContentSize:CGSizeMake(0, offsety)];
}
}
//开始滚动
-(void) startScroll{
if (!timer)
timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES];
[timer fire];
}
//滚动处理
-(void) setScrollText{
[self setHidden:NO];
CGFloat starty = scrollViewText.contentSize.height-25;
[UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{
CGRect rect;
CGFloat offsety = starty;
int i ;
for ( i= 0; i<scrollViewText.subviews.count ; i++){
UILabel *lab = (UILabel *)[scrollViewText.subviews objectAtIndex:i];
rect = lab.frame;
offsety = rect.origin.y - 10;
if (offsety<-100) {
[lab setTextColor:[UIColor clearColor]];
offsety = starty;
}
else{
[lab setTextColor:[Utils getColor:@"666666"]];
}
lab.frame = CGRectMake(20, offsety, rect.size.width, rect.size.height);
}
NSLog(@"offsety:%f",offsety);
}];
}
-(void)shutdown{
[timer invalidate];
timer = nil;
}
@end
