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圆圈loader的动画

2024-10-26 20:16:39   209人阅读

圆圈loader的动画

by 伍雪颖

技术分享

github代码

- (void)awakeFromNib {
    [selfsetup];
    [self startAnimation];
}

- (void)setup {
    self.backgroundColor= [UIColorclearColor];
    self.backgroundLayer= [CAShapeLayerlayer];
    _backgroundLayer.strokeColor= [UIColorcolorWithRed:0.129green:0.455blue:0.627alpha:1.0].CGColor;
    _backgroundLayer.fillColor= self.backgroundColor.CGColor;
    _backgroundLayer.lineCap= kCALineCapRound;
    _backgroundLayer.lineWidth= 1;
    [self.layeraddSublayer:_backgroundLayer];
}

- (void)startAnimation {
    CGFloat startAngle = - ((float)M_PI/ 2);
    CGFloat endAngle = (1.8f* (float)M_PI) + startAngle;
   
    UIBezierPath*processBackgroundPath = [UIBezierPathbezierPath];
    processBackgroundPath.lineWidth= 1;
    [processBackgroundPath addArcWithCenter:CGPointMake(self.bounds.size.width/2,self.bounds.size.height/2)
                                     radius:(self.bounds.size.width- 1)/2
                                 startAngle:startAngle
                                   endAngle:endAngle
                                  clockwise:YES];
    _backgroundLayer.path= processBackgroundPath.CGPath;
   
    CABasicAnimation*rotationAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue= [NSNumbernumberWithFloat:M_PI* 2.0];
    rotationAnimation.duration= 1;
    rotationAnimation.cumulative= YES;
    rotationAnimation.repeatCount= HUGE_VALF;
    [_backgroundLayeraddAnimation:rotationAnimationforKey:@"rotationAnimation"];
}

- (void)drawRect:(CGRect)rect {
    _backgroundLayer.frame= self.bounds;
}

圆圈loader的动画


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