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该跑马灯完全通过CATextLayer 实现#xff0c;轻量级#xff0c;并且通过 系统的位移动画实现滚动效果#xff0c;避免了使用displaylink造成的性能瓶颈#xff0c;使用系统动画#xff0c;系统自动做了很多性能优化#xff0c;实现更好的性能#xff0c;并使用…效果图
该跑马灯完全通过CATextLayer 实现轻量级并且通过 系统的位移动画实现滚动效果避免了使用displaylink造成的性能瓶颈使用系统动画系统自动做了很多性能优化实现更好的性能并使用遮罩实现展示范围的限定 实现跑马灯效果
//
// LBMarqueeLayer.m
// TEXT
//
// Created by mac on 2024/4/28.
// Copyright © 2024 刘博. All rights reserved.
//#import LBMarqueeLayer.himplementation LBMarqueeLayerConfig- (instancetype)init
{self [super init];if (self) {self.velocity 20;self.fontSize 14;self.textColor [UIColor darkGrayColor];self.pauseDuration 3;self.blankString ;}return self;
}endinterface LBMarqueeLayer () CAAnimationDelegateproperty (nonatomic, strong) CATextLayer *textLayer;property (nonatomic, strong) CALayer *maskLayer;property (nonatomic, strong) LBMarqueeLayerConfig *config;property (nonatomic, strong) CABasicAnimation *animation;endimplementation LBMarqueeLayer- (instancetype)initwithFrame:(CGRect)frameconfig:(LBMarqueeLayerConfig *)config
{if ([super init]) {self.frame frame;self.config config;[self handleText];[self addSublayer:self.textLayer];}return self;
}- (void)handleText
{CGFloat width [self.config.text sizeWithAttributes:{NSFontAttributeName:[UIFont systemFontOfSize:self.config.fontSize]}].width;if (width CGRectGetWidth(self.bounds)) {NSString *content [NSString stringWithFormat:%%%, self.config.text, self.config.blankString, self.config.text];NSAttributedString *attributedString [[NSAttributedString alloc] initWithString:content attributes:{NSFontAttributeName:[UIFont systemFontOfSize:self.config.fontSize]}];self.textLayer.string attributedString;CGFloat width [content sizeWithAttributes:{NSFontAttributeName: [UIFont systemFontOfSize:self.config.fontSize]}].width;self.textLayer.frame CGRectMake(0, 0, width, CGRectGetHeight(self.bounds));CGFloat toValue [[NSString stringWithFormat:%%, self.config.text, self.config.blankString] sizeWithAttributes:{NSFontAttributeName:[UIFont systemFontOfSize:self.config.fontSize]}].width;self.animation.fromValue (0);self.animation.toValue (-toValue);self.animation.duration toValue/self.config.velocity;[self.textLayer addAnimation:self.animation forKey:animation];self.masksToBounds YES;} else {self.textLayer.string self.config.text;}}#pragma mark - animationDelegate- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{if (flag) {dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.config.pauseDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{[self.textLayer addAnimation:self.animation forKey:animation];});}}#pragma mark - lazy load- (CATextLayer *)textLayer{if (!_textLayer) {_textLayer [[CATextLayer alloc] init];_textLayer.frame CGRectMake(0, 0, CGRectGetWidth(self.frame), CGRectGetHeight(self.frame));_textLayer.alignmentMode kCAAlignmentLeft;_textLayer.fontSize 14;_textLayer.foregroundColor self.config.textColor.CGColor;}return _textLayer;}- (CALayer *)maskLayer{if (!_maskLayer) {_maskLayer [[CALayer alloc] init];_maskLayer.frame self.bounds;}return _maskLayer;}- (CABasicAnimation *)animation{if (!_animation) {_animation [CABasicAnimation animationWithKeyPath:transform.translation.x];if (!self.config.hasPause) {_animation.repeatCount NSIntegerMax;}_animation.delegate self;}return _animation;}end
调用 - (LBMarqueeLayer *)textLayer
{if (!_textLayer) {LBMarqueeLayerConfig *config [[LBMarqueeLayerConfig alloc] init];config.hasPause YES;config.pauseDuration 3;config.blankString ;config.text 这是一首非常好听的歌曲哈哈哈哈;_textLayer [[LBMarqueeLayer alloc] initwithFrame:CGRectMake(100, 100, 200, 50) config:config];_textLayer.backgroundColor [UIColor cyanColor].CGColor;}return _textLayer;
}
