代碼如下：
#import "Ridehorselight.h"
@interface Ridehorselight ()
@property (nonatomic, strong) NSTimer *timer; //定時(shí)器
@property (nonatomic, weak) UIView *viewAnima; //Label的背景
@property (nonatomic, weak) UILabel *customLabel; //Label
@end
@implementation Ridehorselight
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self addClildView];
[self setTimer];
}
- (void)addClildView {
self.view.backgroundColor = [UIColor whiteColor];
CGFloat viewX = (self.view.frame.size.width-200)/2;
UIView *viewAnima = [[UIView alloc] initWithFrame:CGRectMake(viewX, 100, 200, 40)];
viewAnima.backgroundColor = [UIColor yellowColor];
self.viewAnima = viewAnima;
self.viewAnima.clipsToBounds = YES; //剪掉超出view范圍部分
CGFloat customLabelY = (self.viewAnima.frame.size.height-30)/2;
UILabel *customLabel = [[UILabel alloc]initWithFrame:CGRectMake(self.viewAnima.frame.size.width, customLabelY, 200, 30)];
customLabel.text = @"跑馬燈效果松却，滾動(dòng)文本扩然！";
customLabel.textColor = [UIColor redColor];
self.customLabel = customLabel;
[self.view addSubview:viewAnima];
[viewAnima addSubview:customLabel];
}
- (void)setTimer {
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(changePos) userInfo:nil repeats:YES];
}
- (void)changePos {
CGPoint cenPos = self.customLabel.center;
if (cenPos.x < -100) {
CGFloat distance = self.customLabel.frame.size.width/2;
self.customLabel.center = CGPointMake(self.viewAnima.frame.size.width+distance, 20);
} else {
self.customLabel.center = CGPointMake(cenPos.x-5, 20);
}
}
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