前言
前些天看到一个设计图，关于分期付款选择期数的，有多个节点。它像是一个sliderView,但是sliderView实现不了多个节点按钮。所以，我就想到了自定义sliderView。DCSliderView
设计图如下：
期数设计图.png
最终效果图如下：
DCSliderView.gif
设计思路
-
先添加一个底层view，然后在底层view上画出背景layer,这里是六个小圆，和一个细长矩形。
-
小圆点是可点的，所以还要创建六个btn,并添加下标题。
-
在底层view的上方添加一个view，充当滑动控制器。
-
在滑动控制器上添加拖拽手势，并且控制滑动时，只改变控制器的X坐标，Y轴保持不变。
-
绘制绿色layer跟随滑动控制器而动。
-
处理各个按钮的点击事件，让滑动控制器跟绿色layer随之改变。
-
处理细节，吸附功能，点亮下标题，对滑动控制器最小和最大X轴位移的控制。
-
设置代理，在各个方法里触发代理方法。
实现相关功能
- 创建底层view，在view上添加各种layer；创建btn和下标题。
#pragma mark --- 加载所有的layer
- (void)drawWholeShape
{
CGFloat gapX = self.frame.origin.x; //父视图距离屏幕左边的距离(实现各个圆之间的间距逐渐增大，我自己设置了几个参数，大家可以根据自己的实际情况去改变圆之间的间距。不是非要按照这个来，这里只是提供思路。）
// 用贝塞尔函数画出细长矩形路径
UIBezierPath *recPath = [UIBezierPath bezierPath];
[recPath moveToPoint:CGPointMake(8, 4)];//上起点
[recPath addLineToPoint:CGPointMake(8, 8)];//下起点
[recPath addLineToPoint:CGPointMake(8+WIDTH-2*gapX, 8)];//下结束点
[recPath addLineToPoint:CGPointMake(8+WIDTH-2*gapX, 4)];//上结束点
// 用CAShapeLayer绘制细长矩形
CAShapeLayer *tubeShape = [[CAShapeLayer alloc]init];
tubeShape.path = recPath.CGPath;
tubeShape.strokeColor = [UIColor colorWithRed:224/255.0 green:224/255.0 blue:224/255.0 alpha:1].CGColor;// 外边框颜色
tubeShape.fillColor = [UIColor colorWithRed:224/255.0 green:224/255.0 blue:224/255.0 alpha:1].CGColor;// 内部填充颜色
[_holeShapeView.layer addSublayer:tubeShape];
NSArray *title = TITLE;
// for 循环绘制六个灰色小圆跟绿色小圆，创建六个btn,下标题并添加进数组
for (int i = 0; i <6; i ++) {
//灰色小圆
UIBezierPath *leftSemiPath1 = [UIBezierPath bezierPath];
CGPoint pointR1 = CGPointMake(12 +(_yy+_xx*i)*i, 6);
[leftSemiPath1 addArcWithCenter:pointR1 radius:6 startAngle:(0.0 * M_PI) endAngle:(2.0 * M_PI) clockwise:YES];
CAShapeLayer *leftSemiShape1 = [[CAShapeLayer alloc]init];
leftSemiShape1.path = leftSemiPath1.CGPath;
leftSemiShape1.strokeColor = [UIColor colorWithRed:224/255.0 green:224/255.0 blue:224/255.0 alpha:1].CGColor;
leftSemiShape1.fillColor = [UIColor colorWithRed:224/255.0 green:224/255.0 blue:224/255.0 alpha:1].CGColor;
[_holeShapeView.layer addSublayer:leftSemiShape1];
// 绿色小圆
UIBezierPath *leftSemiPath2 = [UIBezierPath bezierPath];
CGPoint pointR2 = CGPointMake(12 +(_yy+_xx*i)*i, 6);
[leftSemiPath2 addArcWithCenter:pointR2 radius:4 startAngle:(0.0 * M_PI) endAngle:(2.0 * M_PI) clockwise:YES];
CAShapeLayer *leftSemiShape2 = [[CAShapeLayer alloc]init];
leftSemiShape2.path = leftSemiPath2.CGPath;
leftSemiShape2.strokeColor = K_CGColor;
leftSemiShape2.fillColor = K_CGColor;
[self.btnLayerArr addObject:leftSemiShape2];
if (i==0) {
// 将第一个绿色小圆添加到底层view上
[_holeShapeView.layer addSublayer:leftSemiShape2];
}
float x = 4 +(_yy+_xx*i)*i;
// 创建btn
UIButton *stepBtn = [[UIButton alloc]initWithFrame:CGRectMake(x, -2, 14, 14)];
[_btnArr addObject:stepBtn];
[self.btnOriginXArr addObject:@(x)];
stepBtn.tag = i;
[stepBtn addTarget:self action:@selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:stepBtn];
// 创建下标题
UILabel *qiShuLabel = [[UILabel alloc]init];
qiShuLabel.center = CGPointMake(x-4, 20);
qiShuLabel.text = title[i];
qiShuLabel.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
qiShuLabel.font = [UIFont systemFontOfSize:12];
[qiShuLabel sizeToFit];
[self addSubview:qiShuLabel];
[self.titleLabelArr addObject:qiShuLabel];
}
}
2 . 创建滑动控制器view，并添加滑动手势。
- (void)initTargetView
{
_targetView = [[UIImageView alloc]initWithFrame:CGRectMake(0, -6, 22, 22)];
_targetView.image = [UIImage imageNamed:@"target"];
_targetView.userInteractionEnabled = YES;
UIPanGestureRecognizer *imageViewPanGesture = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGesture:)];
[_targetView addGestureRecognizer:imageViewPanGesture];
[self addSubview:_targetView];
}
//在移动过程中，UIGestureRecognizerStateChanged 这个状态会调用很多次，在这里面处理绿色细长矩形的绘制，添加或删除绿色小圆layer。
//在移动结束时，UIGestureRecognizerStateEnded 这个状态只调用一次，在这里处理最终的绿色细长矩形，绿色小圆，下标题的点亮，吸附功能。
- (void)panGesture:(UIPanGestureRecognizer *)gesture
{
CGFloat y;
switch (gesture.state) {
case UIGestureRecognizerStateBegan:
{
CGRect rect = gesture.view.frame;
y = rect.origin.y ;
}
break;
case UIGestureRecognizerStateChanged:
{
// 获得添加手势的对象
// 获得滑动的距离 包含 x y 移动的数值
CGPoint point =[gesture translationInView:gesture.view];
CGRect targetRect = _targetView.frame;
CGFloat targetX = targetRect.origin.x;
// 绿色的细长矩形
[_recPath removeAllPoints];// 这个方法会调用很多次，每次调用都会绘制一条路径，为了实现绿色路径跟随滑动控制器而动的效果，所有每次绘制之前都移除掉所有的点，其它地方有这样的处理都是一个道理。
[_recPath moveToPoint:CGPointMake(8, 5.8)];
[_recPath addLineToPoint:CGPointMake(8, 7)];
if (targetX>8) {// 避免超出最小范围
[_recPath addLineToPoint:CGPointMake(targetX, 7)];
[_recPath addLineToPoint:CGPointMake(targetX, 5.8)];
}
[_recPath closePath];
_tubeShape.path = _recPath.CGPath;
[_tubeShape setNeedsDisplay];
[self.layer addSublayer:_tubeShape];
NSArray *titleArr = TITLE;
for (int i = 0; i <6; i ++) {
if (i!=5) {
// 滑动过程中添加和删除绿色圆layer
if (targetX >= [self.btnOriginXArr[i]integerValue] && targetX < [_btnOriginXArr[i+1]integerValue]) {
// 删除上一个绿色小圆layer
CAShapeLayer *layer = self.btnLayerArr[i+1];
if (layer) {
[layer removeFromSuperlayer];
}
// 添加新的绿色小圆layer
[_holeShapeView.layer addSublayer:self.btnLayerArr[i]];
[_shapeViewDelegate onShapeViewDelegateEventWithString:titleArr[i]];// 调用代理方法，回调期数
}
}
}
//CGRectOffset是以试图的原点为起始 移动 dx x移动距离 dy y移动距离
gesture.view.frame =CGRectOffset(gesture.view.frame, point.x, y );// 改变滑动控制器的frame，只改变X，Y坐标保持不变。
//清空移动距离
[gesture setTranslation:CGPointZero inView:gesture.view];
}
break;
case UIGestureRecognizerStateEnded:
{
CGRect targetRect = _targetView.frame;
CGFloat targetX = targetRect.origin.x;
float btnX = [self.btnOriginXArr.lastObject integerValue];
// targetView在第一个圆
if (targetX<0) {
targetRect.origin.x = 0;
_targetView.frame = targetRect;
[_shapeViewDelegate onShapeViewDelegateEventWithString:@"1期"];
// 改变下标题颜色
for (UILabel *label in self.titleLabelArr) {
label.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
}
UILabel *firstLabel = self.titleLabelArr.firstObject;
firstLabel.textColor = [UIColor colorWithCGColor:K_CGColor];
break;
}
// targetView在最后一个圆
if (targetX >btnX) {
targetRect.origin.x = btnX;
_targetView.frame = targetRect;
[_shapeViewDelegate onShapeViewDelegateEventWithString:@"12期"];
// 改变下标题颜色
for (UILabel *label in self.titleLabelArr) {
label.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
}
UILabel *firstLabel = self.titleLabelArr.lastObject;
firstLabel.textColor = [UIColor colorWithCGColor:K_CGColor];
break;
}
NSArray *titleArr = TITLE;
// targetView 在中间各个圆
for (int i = 0; i <6; i ++) {
if (i!=5) {
if (targetX >= [self.btnOriginXArr[i]integerValue] && targetX < [_btnOriginXArr[i]integerValue]+15.0 +_middleGap*i) {
NSLog(@"%ld",(long)[_btnOriginXArr[i]integerValue]);
targetRect.origin.x = [_btnOriginXArr[i]integerValue];
_targetView.frame = targetRect;
[_shapeViewDelegate onShapeViewDelegateEventWithString:titleArr[i]];
for (UILabel *label in self.titleLabelArr) {
label.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
}
UILabel *firstLabel = self.titleLabelArr[i];
firstLabel.textColor = [UIColor colorWithCGColor:K_CGColor];
}
else if(targetX >=[_btnOriginXArr[i]integerValue]+10.0 + _middleGap*i)
{
targetRect.origin.x = [_btnOriginXArr[i+1]integerValue];
_targetView.frame = targetRect;
[_shapeViewDelegate onShapeViewDelegateEventWithString:titleArr[i+1]];
// 改变下标题颜色
for (UILabel *label in self.titleLabelArr) {
label.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
}
UILabel *firstLabel = self.titleLabelArr[i+1];
firstLabel.textColor = [UIColor colorWithCGColor:K_CGColor];
}
}
}
// 先移除贝塞尔所有的点,然后重新绘制贝塞尔路径
[_recPath removeAllPoints];
[_recPath moveToPoint:CGPointMake(8, 5.8)];
[_recPath addLineToPoint:CGPointMake(8, 7)];
[_recPath addLineToPoint:CGPointMake(_targetView.frame.origin.x, 7)];
[_recPath addLineToPoint:CGPointMake(_targetView.frame.origin.x, 5.8)];
[_recPath closePath];
_tubeShape.path = _recPath.CGPath;
[_tubeShape setNeedsDisplay];
[self.layer addSublayer:_tubeShape];
}
break;
default:
break;
}
}
3 . 处理按钮的点击事件。
- (void)onBtnClick:(UIButton *)btn
{
NSArray *titleArr = TITLE;
[_shapeViewDelegate onShapeViewDelegateEventWithString:titleArr[btn.tag]];// 回调代理
// 滑动控制器frame动画
[UIView animateWithDuration:0.3 animations:^{
NSInteger x = [_btnOriginXArr[btn.tag]integerValue];
CGRect rect = _targetView.frame;
rect.origin.x = x;
_targetView.frame = rect;
} completion:^(BOOL finished) {
// 改变下标题颜色
for (UILabel *label in self.titleLabelArr) {
label.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
}
UILabel *firstLabel = self.titleLabelArr[btn.tag];
firstLabel.textColor = [UIColor colorWithCGColor:K_CGColor];
}];
// layer的动画没处理好，这里通过延迟处理，实现相关功能，下次layer动画处理好了再补充上来。
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.15 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
//绿色小圆layer的添加和删除
for (CAShapeLayer *layer in self.btnLayerArr) {
[layer removeFromSuperlayer];
}
for (int i = 0; i < btn.tag+1; i ++) {
[_holeShapeView.layer addSublayer:self.btnLayerArr[i]];
}
// 先移除贝塞尔所有的点,然后重新绘制贝塞尔路径
[_recPath removeAllPoints];
[_recPath moveToPoint:CGPointMake(8, 5.8)];
[_recPath addLineToPoint:CGPointMake(8, 7)];
if (_targetView.frame.origin.x > 8) {// 控制最小距离
[_recPath addLineToPoint:CGPointMake(_targetView.frame.origin.x, 7)];
[_recPath addLineToPoint:CGPointMake(_targetView.frame.origin.x, 5.8)];
}
[_recPath closePath];
_tubeShape.path = _recPath.CGPath;
[_tubeShape setNeedsDisplay];
[self.layer addSublayer:_tubeShape];
});
}
具体使用方法
下载好我的demo,在工程中导入DCSliderView类，设置代理ShapeViewDelegate，具体代码如下：
// 1.
DCSliderView *shapeView = [[DCSliderView alloc]initWithFrame:CGRectMake(10, 60, self.view.frame.size.width -20, 30) WithLayerColor:[UIColor colorWithRed:0/255.0 green:210/255.0 blue:87/255.0 alpha:1]];
// DCSliderView 的左右间距10 ，宽度self.view.frame.size.width -20，最好不要变。
// 2.
shapeView.shapeViewDelegate = self;
//3.
[self.view addSubview:shapeView];
_qiShuLabel = [[UILabel alloc]init];
_qiShuLabel.center = CGPointMake(self.view.frame.size.width/2-30, 160);
_qiShuLabel.textColor = [UIColor colorWithRed:153/255.0 green:153/255.0 blue:153/255.0 alpha:1];
_qiShuLabel.font = [UIFont systemFontOfSize:14];
_qiShuLabel.text = @"1期" ;
[_qiShuLabel sizeToFit];
[self.view addSubview:_qiShuLabel];
// 4.代理方法
- (void)onShapeViewDelegateEventWithString:(NSString *)str
{
_qiShuLabel.text = str ;
[_qiShuLabel sizeToFit];
}
需要注意的一点是，由于各个小圆之间的间距是逐渐增大的，所以我根据屏幕的宽度设置了几个不同的系数去适配，如果你没有使用我代码中的宽度，适配就会出现问题。其实本文只是一个引子，主讲设计思路，你可以按照自己的实际情况去具体设计。当然，如果你不想动手修改的话，那就得按照我设计的来。
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