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];

}

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