概述

根据UIBezierPath和CAShapeLayer自定义倒计时进度条，适用于app启动的时候设置一个倒计时关闭启动页面。可以设置进度条颜色，填充颜色，进度条宽度以及点击事件等。

详细

我们都知道 APP启动时加载的是LaunchImage 这张静态图。现在好多应用启动时都是动态的,并且右上角可选择跳过。

这里介绍一下自己在做这种动画时的一种方案。

启动图依然是加载的，只不过是一闪而过，这时候我想到的是拿到当前的LaunchImage图片，然后进行处理，造成一种改变了LaunchImage动画的假象。

思路如下:

根据UIBezierPath和CAShapeLayer自定义倒计时进度条，适用于app启动的时候设置一个倒计时关闭启动页面。可以设置进度条颜色，填充颜色，进度条宽度以及点击事件等。

一、设置跳过按钮

ZLDrawCircleProgressBtn.h:

/***  set complete callback**  @param lineWidth line width*  @param block     block*  @param duration  time*/
- (void)startAnimationDuration:(CGFloat)duration withBlock:(DrawCircleProgressBlock )block;

ZLDrawCircleProgressBtn.m :

先初始化相关跳过按钮及进度圈:

// 底部进度条圈
@property (nonatomic, strong) CAShapeLayer *trackLayer;
// 表层进度条圈
@property (nonatomic, strong) CAShapeLayer *progressLayer;
@property (nonatomic, strong) UIBezierPath *bezierPath;
@property (nonatomic, copy)   DrawCircleProgressBlock myBlock;

- (instancetype)initWithFrame:(CGRect)frame
{if (self == [super initWithFrame:frame]) {self.backgroundColor = [UIColor clearColor];[self.layer addSublayer:self.trackLayer];}return self;
}

- (UIBezierPath *)bezierPath {if (!_bezierPath) {CGFloat width = CGRectGetWidth(self.frame)/2.0f;CGFloat height = CGRectGetHeight(self.frame)/2.0f;CGPoint centerPoint = CGPointMake(width, height);float radius = CGRectGetWidth(self.frame)/2;_bezierPath = [UIBezierPath bezierPathWithArcCenter:centerPointradius:radiusstartAngle:degreesToRadians(-90)endAngle:degreesToRadians(270)clockwise:YES];}return _bezierPath;
}

底部进度条圈:

- (CAShapeLayer *)trackLayer {if (!_trackLayer) {_trackLayer = [CAShapeLayer layer];_trackLayer.frame = self.bounds;// 圈内填充色_trackLayer.fillColor = self.fillColor.CGColor ? self.fillColor.CGColor : [UIColor clearColor].CGColor ;_trackLayer.lineWidth = self.lineWidth ? self.lineWidth : 2.f;// 底部圈色_trackLayer.strokeColor = self.trackColor.CGColor ? self.trackColor.CGColor : [UIColor colorWithRed:197/255.0 green:159/255.0 blue:82/255.0 alpha:0.3].CGColor ;_trackLayer.strokeStart = 0.f;_trackLayer.strokeEnd = 1.f;_trackLayer.path = self.bezierPath.CGPath;}return _trackLayer;
}

表层进度条圈:

- (CAShapeLayer *)progressLayer {if (!_progressLayer) {_progressLayer = [CAShapeLayer layer];_progressLayer.frame = self.bounds;_progressLayer.fillColor = [UIColor clearColor].CGColor;_progressLayer.lineWidth = self.lineWidth ? self.lineWidth : 2.f;_progressLayer.lineCap = kCALineCapRound;// 进度条圈进度色_progressLayer.strokeColor = self.progressColor.CGColor ? self.progressColor.CGColor  : [UIColor  colorWithRed:197/255.0 green:159/255.0 blue:82/255.0 alpha:1].CGColor;_progressLayer.strokeStart = 0.f;CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];pathAnimation.duration = self.animationDuration;pathAnimation.fromValue = @(0.0);pathAnimation.toValue = @(1.0);pathAnimation.removedOnCompletion = YES;pathAnimation.delegate = self;[_progressLayer addAnimation:pathAnimation forKey:nil];_progressLayer.path = _bezierPath.CGPath;}return _progressLayer;
}

设置代理回调:

#pragma mark -- CAAnimationDelegate
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {if (flag) {self.myBlock();}
}
#pragma mark ---
- (void)startAnimationDuration:(CGFloat)duration withBlock:(DrawCircleProgressBlock )block {self.myBlock = block;self.animationDuration = duration;[self.layer addSublayer:self.progressLayer];
}

二、启动页

ZLStartPageView.h :

露出 显示引导页面方法:

/***  显示引导页面方法*/
- (void)show;

ZLStartPageView.m :

1. 初始化启动页

// 启动页图
@property (nonatomic,strong) UIImageView *imageView;
// 跳过按钮
@property (nonatomic, strong) ZLDrawCircleProgressBtn *drawCircleBtn;

- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {// 1.启动页图片_imageView = [[UIImageView alloc]initWithFrame:frame];_imageView.contentMode = UIViewContentModeScaleAspectFill;_imageView.image = [UIImage imageNamed:@"LaunchImage_667h"];[self addSubview:_imageView];// 2.跳过按钮ZLDrawCircleProgressBtn *drawCircleBtn = [[ZLDrawCircleProgressBtn alloc]initWithFrame:CGRectMake(kscreenWidth - 55, 30, 40, 40)];drawCircleBtn.lineWidth = 2;[drawCircleBtn setTitle:@"跳过" forState:UIControlStateNormal];[drawCircleBtn setTitleColor:[UIColor  colorWithRed:197/255.0 green:159/255.0 blue:82/255.0 alpha:1] forState:UIControlStateNormal];drawCircleBtn.titleLabel.font = [UIFont systemFontOfSize:14];[drawCircleBtn addTarget:self action:@selector(removeProgress) forControlEvents:UIControlEventTouchUpInside];[self addSubview:drawCircleBtn];self.drawCircleBtn = drawCircleBtn;}return self;
}

2. 显示启动页且完成时候回调移除

- (void)show {//  progress 完成时候的回调__weak __typeof(self) weakSelf = self;[weakSelf.drawCircleBtn startAnimationDuration:showtime withBlock:^{[weakSelf removeProgress];}];UIWindow *window = [UIApplication sharedApplication].keyWindow;[window addSubview:self];
}

3. 移除启动页面

- (void)removeProgress {self.imageView.transform = CGAffineTransformMakeScale(1, 1);self.imageView.alpha = 1;[UIView animateWithDuration:0.3 animations:^{self.drawCircleBtn.hidden = NO;self.imageView.alpha = 0.05;self.imageView.transform = CGAffineTransformMakeScale(5, 5);} completion:^(BOOL finished) {self.drawCircleBtn.hidden = YES;[self.imageView removeFromSuperview];}];
}

三、动态启动页的显示代码放在AppDeleate中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:[[HomeViewController alloc] init]];[self.window makeKeyAndVisible];[self setupStartPageView];return YES;
}

设置启动页:

- (void)setupStartPageView {ZLStartPageView *startPageView = [[ZLStartPageView alloc] initWithFrame:self.window.bounds];[startPageView show];
}

这个时候就可以可以测试喽~

四、压缩文件截图

界面性问题可以根据自己项目需求调整即可, 具体可参考代码, 项目能够直接运行!