简易跑马灯效果，代码简单易懂，适合初学者

/** 新建文件，继承于UIView .h文件代码如下*/

#import

@interfaceTTMarqueeView :UIView

/**

* 跑马灯内容

*/

@property (nonatomic, strong) NSString *marqueeText;

/**

* 关闭定时器

*/

- (void)closeTimer;

@end

/** .m实现文件 */

#import "TTMarqueeView.h"

#import "UIView+add.h"

#define kMarqueeLeftPadding 40

// 屏幕高度

#define kScreenH [UIScreen mainScreen].bounds.size.height

// 屏幕宽度

#define kScreenW [UIScreen mainScreen].bounds.size.width

@interface TTMarqueeView ()

{

UILabel *_marqueeL;

NSTimer *_timer;

}

@end

@implementation TTMarqueeView

- (instancetype)initWithFrame:(CGRect)frame

{

if(self== [superinitWithFrame:frame]) {

[selfsetupviews];

}

return self;

}

- (void)setupviews

{

self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.8];

UIImageView *speakerImg = [UIImageView new];

speakerImg.image= [UIImageimageNamed:@"home_speaker"];

CGSizesize = speakerImg.image.size;

speakerImg.frame=CGRectMake(10, (self.frame.size.height- size.height) /2, size.width, size.height);

[selfaddSubview:speakerImg];

UIView*marqueeBgView = [UIViewnew];

marqueeBgView.backgroundColor = [UIColor clearColor];

marqueeBgView.frame = CGRectMake(CGRectGetMaxX(speakerImg.frame) + 10, 0, self.frame.size.width - CGRectGetMaxX(speakerImg.frame), self.frame.size.height);

marqueeBgView.clipsToBounds=YES;

[selfaddSubview:marqueeBgView];

_marqueeL = ({

UILabel*label = [UILabelnew];

label.text=@"广播";

label.textColor = [UIColor whiteColor];

label.font = [UIFont systemFontOfSize:13];

label.frame=CGRectMake(0,0, marqueeBgView.frame.size.width, marqueeBgView.frame.size.height);

[marqueeBgViewaddSubview:label];

label;

});

}

- (void)closeTimer

{

if(_timer) {

[_timerinvalidate];

_timer=nil;

}

}

- (void)setMarqueeText:(NSString*)marqueeText

{

_marqueeText= marqueeText;

_marqueeL.text= marqueeText;

[_marqueeL sizeToFit];

[self closeTimer];

_marqueeL.left = kScreenW - kMarqueeLeftPadding - 10;

_marqueeL.centerY = self.height / 2;

_timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(resetMarqueeFrame) userInfo:nil repeats:YES];

[[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];

}

- (void)resetMarqueeFrame

{

_marqueeL.left = _marqueeL.left - 0.2;

if (_marqueeL.right < 0) {

_marqueeL.left = kScreenW - kMarqueeLeftPadding - 10;

}

}

@end