头像默认放第一个。
self.head = [[UIImageView alloc] initWithFrame:[self getButtonFrame:0]];
self.head.image = [UIImage imageNamed:@"myHead"];
self.head.layer.borderColor = [UIColor greenColor].CGColor;
self.head.layer.masksToBounds = YES;
self.head.layer.cornerRadius = 25;
self.head.layer.borderWidth = 2.0f;
[self addSubview:self.head];
之后按钮点击之后，头像移动到按钮点击的地方。
// 按钮点击事件
- (void)buttonClick:(UIButton *)button {
// 原来图片所在按钮的index
int preIndex = [self getPreviousIndexByFrame:self.head.frame];
int buttonIndex = (int)button.tag - 1;
// 点击图片所在按钮 不做任何操作
if (preIndex == buttonIndex) {
return;
}
CGFloat width = [UIScreen mainScreen].bounds.size.width;
float r = 2 * width / sqrt(3);
//加入动画效果
CALayer *transitionLayer = [[CALayer alloc] init];
//显式事务默认开启动画效果,kCFBooleanTrue关闭 保证begin和commit 之间的属性修改同时进行
transitionLayer.contents = self.head.layer.contents;
transitionLayer.borderColor = [UIColor greenColor].CGColor;
transitionLayer.masksToBounds = YES;
transitionLayer.cornerRadius = 25;
transitionLayer.borderWidth = 2.0f;
transitionLayer.frame = self.head.frame;
transitionLayer.backgroundColor=[UIColor blueColor].CGColor;
[self.layer addSublayer:transitionLayer];
self.head.hidden = YES;
UIBezierPath *movePath;
//路径曲线 贝塞尔曲线
if (buttonIndex > preIndex) {
// 向上滑 逆时针
movePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0) radius:r startAngle:[self getAnticlockwiseByIndex:preIndex] endAngle:[self getAnticlockwiseByIndex:buttonIndex] clockwise:NO];
[movePath moveToPoint:transitionLayer.position];
}else {
// 向下滑 顺时针
movePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0) radius:r startAngle:[self getClockwiseAngleByIndex:preIndex] endAngle:[self getClockwiseAngleByIndex:buttonIndex] clockwise:YES];
[movePath moveToPoint:transitionLayer.position];
}
//关键帧动画效果
CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
// 动画轨迹
positionAnimation.path = movePath.CGPath;
// 动画完成之后是否删除动画效果
positionAnimation.removedOnCompletion = NO;
// 设置开始的时间
positionAnimation.beginTime = CACurrentMediaTime();
CGFloat time = 0.7;
if (labs(buttonIndex - preIndex) > 1) {
time = 0.4 * labs(buttonIndex - preIndex);
}
//动画总时间
positionAnimation.duration = time;
// 动画的方式 淡入淡出
positionAnimation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
// 执行完之后保存最新的状态
positionAnimation.fillMode = kCAFillModeForwards;
// 动画完成之后，是否回到原来的地方
positionAnimation.autoreverses= NO;
[transitionLayer addAnimation:positionAnimation forKey:@"opacity"];
[CATransaction setCompletionBlock:^{
[NSThread sleepForTimeInterval:time];
self.head.hidden = NO;
self.head.frame = button.frame;
[transitionLayer removeFromSuperlayer];
}];
}
// 根据Index获得顺时针的弧度
- (float)getAnticlockwiseByIndex: (NSInteger)index {
return M_PI * (0.5 - (7.5 + 15 * index) / 180);
}
// 根据Index获得逆时针的弧度
- (float)getClockwiseAngleByIndex: (NSInteger)index {
index = 3 - index;
return M_PI * (30 + 7.5 + 15 * index) / 180;
}
