iOS开发之跑马灯滚动条的两种方法与实现

跑马灯效果的滚动条，一般出现在ios应用的底部。用于显示动态变化的信息或内容较长的信息，在个类应用中使用广泛 以下两种可用的跑马灯滚动MarqueeBar的实现。 1.直接在ViewController中实现对UIView的位置定时移动来实现，以下代码直接加入到ViewController中，在viewWillAppear中调用loadView即可。 - (void)marqueeView{ CGRect frame = self.vMarqueeContainer.frame; frame.origin.x = frame.origin.x -2; if(frame.origin.x < -frame sizewidth br> { frame.origin.x = 320; } self.vMarqueeContainer.frame = frame; //延时递归调用 [self performSelector:@selector(marqueeView) withObject:nil afterDelay:0.04];}- (void)loadView{ //marqueenbar背景，位置高度等控制 UIView *viewMarqueeBar = [[[UIView alloc]initWithFrame:CGRectMake(0, 347, 320, 20)]autorelease]; [viewMarqueeBar setBackgroundColor:[UIColor darkGrayColor]]; //滚动容器，显示滚动范围 UIView *viewMarqueeContainer = [[[UIView alloc]initWithFrame:CGRectMake(320, 3, 360, 14)]autorelease]; [viewMarqueeContainer setBackgroundColor:[UIColor clearColor]]; [viewMarqueeContainer setClipsToBounds:YES]; [viewMarqueeContainer setOpaque:YES]; //内容 UILabel *lblContent = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50,14)]autorelease]; [lblContent setText:@"这里是滚动条。。。。。"]; [lblContent setTextColor:[UIColor whiteColor]]; [lblContent setBackgroundColor:[UIColor clearColor]]; [lblContent setFont:[UIFont fontWithName:@"Helvetica" size:12]]; [lblContent setOpaque:YES]; self.view= viewMarqueeBar; self.vMarqueeContainer = viewMarqueeContainer; [self.view addSubview:viewMarqueeContainer]; [self marqueeView];} 2.自行定义滚动条控件，让view自己滚动起来，通过不断的相互方法调用实现循环滚动 UIMarqueeBarView.h定义 /** *UIMarqueeBarView.h */@interface UIMarqueeBarView : UIView{}- (void)start;- (void)stop;@end UIMarqueeBarView.m实现 /** *UIMarqueeBarView.m */ #import "UIMarqueeBarView.h"@implementation UIMarqueeBarView- (void)dealloc{ [super dealloc];}- (id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { // Initialization code [self setupView]; } return self;}-(id)initWithCoder:(NSCoder *)aDecoder { if( (self = [super initWithCoder:aDecoder]) ) { // Initialization code [self setupView]; } return self;}- (void)setupView{ [self setBackgroundColor:[UIColor lightGrayColor]]; [self setClipsToBounds:YES]; [self setOpaque:YES]; UILabel *lblContent = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 150 ,16)]autorelease]; [lblContent setText:@"这里是滚动条。。。。。"]; [lblContent setTextColor:[UIColor whiteColor]]; [lblContent setBackgroundColor:[UIColor clearColor]]; [lblContent setFont:[UIFont fontWithName:@"Helvetica" size:14]]; [lblContent setNumberOfLines:1]; [lblContent setOpaque:YES]; [self addSubview:lblContent];}- (void)start{ if (self.viewContainer == NULL) { [self setupView]; } [self startAnimation];}- (void)stop{ }-(void)startAnimation{ [UIView beginAnimations:@"MarqueeBarAniamation" context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationDuration:25]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; CGRect viewFrame = self.viewContainer.frame; viewFrame.origin.x = -320; [self.viewContainer setFrame:viewFrame]; [UIView commitAnimations];}-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context{ CGRect viewFrame = self.viewContainer.frame; viewFrame.origin.x = 320; [self.viewContainer setFrame:viewFrame]; [self startAnimation];} -------------------------------------------------------------------------------------- - 版权声明： - 如在本页面内无特别说明，本文内容均为[李大仁博客]原创，本文版权归[李大仁博客]所有。 - 欢迎转载，转载请务必在文章页面明显位置提供原文链接并注明出处。欢迎您在转载本文时保留本段声明。 - 文章标题： ios开发之跑马灯滚动MarqueeBar的两种方法与实现 - 独立博客： 李大仁博客 - 永久链接：http://www.lidaren.com/archives/775 -------------------------------------------------------------------------------------- 以上内容由博客自动发布工具自动发布，最终显示内容和效果会与原文内容有所偏差，敬请谅解。