UI效果
实现的思路
就是通过贝塞尔曲线画出时间轴的圆环的路径，然后
使用CAShaper来渲染UI，再通过
animation.beginTime = [cilrclLayer convertTime:CACurrentMediaTime() fromLayer:nil] + circleTimeOffset 来设置每个圆环的动画开始时间，
，每个地方都是有两层layer的，一层是底部灰色样式的（即没有到达时候的颜色）一层是到达得阶段的颜色，
到达的layer在上面，如果要开启动画，我们就得先将
到达的layer隐藏掉，然后开始动画的时候，将对应的那一条展示，开启动画的时候将hidden置为NO，这时候，其实layer是展示不了的（不会整个展示），因为我们添加了strokeEnd的动画，他会随者动画的进行而逐渐展示，所以我们在动画代理方法animationDidStart中，将layer 设置为可见，（如果没有设置动画代理，也可以在添加动画的时候设置为可见）
代码
//
// LBTimeView.m
// LBTimeLine
//
// Created by mac on 2024/6/9.
//
#import "LBTimeView.h"
#define ScreenWidth [UIScreen mainScreen].bounds.size.width
#define RGB(r, g, b) [UIColor colorWithRed:(r)/255.f green:(g)/255.f blue:(b)/255.f alpha:1.f]
#define SizeScale (([UIScreen mainScreen].bounds.size.width > 320) ? [UIScreen mainScreen].bounds.size.width/320 : 1)
const float BETTWEEN_LABEL_OFFSET = 20;
const float LINE_WIDTH = 1.9;
const float CIRCLE_RADIUS = 3.7;
const float INITIAL_PROGRESS_CONTAINER_WIDTH = 20.0;
const float PROGRESS_VIEW_CONTAINER_LEFT = 51.0;
const float VIEW_WIDTH = 225.0;
@interface LBTimeView ()
{
CGPoint lastpoint;
NSMutableArray *layers;
NSMutableArray *circleLayers;
int layerCounter;
int circleCounter;
CGFloat timeOffset;
CGFloat leftWidth;
CGFloat rightWidth;
CGFloat viewWidth;
}
@end
@implementation LBTimeView
-(id)initWithFrame:(CGRect)frame sum:(NSInteger)sum current:(NSInteger)current{
self = [super initWithFrame:frame];
if (self) {
self.frame = frame;
[self configureTimeLineWithNum:sum andCurrentNum:current];
}
return self;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)configureTimeLineWithNum:(NSInteger)sum andCurrentNum:(NSInteger)currentStatus {
// NSInteger currentStatus = 3;
circleLayers = [[NSMutableArray alloc] init];
layers = [[NSMutableArray alloc] init];
CGFloat U = (ScreenWidth - 80- sum+1)/(sum - 1);
CGFloat betweenLineOffset = 0;
//CGFloat totlaHeight = 8;
// CGFloat yCenter = - 48 + (ScreenWidth - 248)/2;
CGFloat yCenter = 40;
// CGFloat xCenter;
UIColor *strokeColor;
CGPoint toPoint;
CGPoint fromPoint;
int i = 0;
for (int j = 0;j < sum;j ++) {
//configure circle
strokeColor = i < currentStatus ? RGB(224, 0, 30) : RGB(233, 233, 233);
UIBezierPath *circle = [UIBezierPath bezierPath];
[self configureBezierCircle:circle withCenterY:yCenter];
CAShapeLayer *circleLayer = [self getLayerWithCircle:circle andStrokeColor:strokeColor];
//
[circleLayers addObject:circleLayer];
//add static background gray circle
CAShapeLayer *grayStaticCircleLayer = [self getLayerWithCircle:circle andStrokeColor:RGB(233, 233, 233)];
[self.layer addSublayer:grayStaticCircleLayer];
[self.layer addSublayer:circleLayer];
//configure line
if (i > 0) {
fromPoint = lastpoint;
toPoint = CGPointMake(yCenter - CIRCLE_RADIUS,60*SizeScale);
lastpoint = CGPointMake( yCenter + CIRCLE_RADIUS+ 1,60*SizeScale);
UIBezierPath *line = [self getLineWithStartPoint:fromPoint endPoint:toPoint];
CAShapeLayer *lineLayer = [self getLayerWithLine:line andStrokeColor:strokeColor];
// CAShapeLayer *lineLayer2 = [self getLayerWithLine:line andStrokeColor:strokeColor];
[layers addObject:lineLayer];
//add static background gray line
CAShapeLayer *grayStaticLineLayer = [self getLayerWithLine:line andStrokeColor:RGB(233, 233, 233)];
[self.layer addSublayer:grayStaticLineLayer];
[self.layer addSublayer:lineLayer];
} else {
lastpoint = CGPointMake( yCenter + CIRCLE_RADIUS+1,60*SizeScale);
}
betweenLineOffset = BETTWEEN_LABEL_OFFSET;
yCenter += U;
i++;
}
}
- (CAShapeLayer *)getLayerWithLine:(UIBezierPath *)line andStrokeColor:(UIColor *)strokeColor {
CAShapeLayer *lineLayer = [CAShapeLayer layer];
lineLayer.path = line.CGPath;
lineLayer.strokeColor = strokeColor.CGColor;
lineLayer.fillColor = nil;
lineLayer.lineWidth = 1.4;
return lineLayer;
}
- (UIBezierPath *)getLineWithStartPoint:(CGPoint)start endPoint:(CGPoint)end {
UIBezierPath *line = [UIBezierPath bezierPath];
[line moveToPoint:start];
[line addLineToPoint:end];
return line;
}
- (CAShapeLayer *)getLayerWithCircle:(UIBezierPath *)circle andStrokeColor:(UIColor *)strokeColor {
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.path = circle.CGPath;
circleLayer.strokeColor = strokeColor.CGColor;
circleLayer.fillColor = nil;
circleLayer.lineWidth = LINE_WIDTH;
circleLayer.lineJoin = kCALineJoinBevel;
return circleLayer;
}
- (void)configureBezierCircle:(UIBezierPath *)circle withCenterY:(CGFloat)centerY {
[circle addArcWithCenter:CGPointMake( centerY,60*SizeScale)
radius:CIRCLE_RADIUS
startAngle:M_PI_2
endAngle:-M_PI_2
clockwise:YES];
[circle addArcWithCenter:CGPointMake(centerY,60*SizeScale)
radius:CIRCLE_RADIUS
startAngle:-M_PI_2
endAngle:M_PI_2
clockwise:YES];
}
- (void)startAnimatingWithCurrentIndex:(NSInteger)index
{
for (CAShapeLayer *layer in layers) {
layer.hidden = YES;
}
[self startAnimatingLayers:circleLayers forStatus:index];
}
- (void)startAnimatingLayers:(NSArray *)layersToAnimate forStatus:(NSInteger)currentStatus {
float circleTimeOffset = 1;
circleCounter = 0;
int i = 1;
//add with animation
for (CAShapeLayer *cilrclLayer in layersToAnimate) {
[self.layer addSublayer:cilrclLayer];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
animation.duration = 0.2;
animation.beginTime = [cilrclLayer convertTime:CACurrentMediaTime() fromLayer:nil] + circleTimeOffset;
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat:1.0f];
animation.fillMode = kCAFillModeForwards;
animation.delegate =(id <CAAnimationDelegate>) self;
circleTimeOffset += .4;
[cilrclLayer setHidden:YES];
[cilrclLayer addAnimation:animation forKey:@"strokeCircleAnimation"];
if (self.lastBlink && i == currentStatus && i != [layersToAnimate count]) {
CABasicAnimation *strokeAnim = [CABasicAnimation animationWithKeyPath:@"strokeColor"];
strokeAnim.fromValue = (id) [UIColor orangeColor].CGColor;
strokeAnim.toValue = (id) [UIColor clearColor].CGColor;
strokeAnim.duration = 1.0;
strokeAnim.repeatCount = HUGE_VAL;
strokeAnim.autoreverses = NO;
[cilrclLayer addAnimation:strokeAnim forKey:@"animateStrokeColor"];
}
i++;
}
}
- (void)animationDidStart:(CAAnimation *)anim {
if (circleCounter < circleLayers.count) {
if (anim == [circleLayers[circleCounter] animationForKey:@"strokeCircleAnimation"]) {
[circleLayers[circleCounter] setHidden:NO];
circleCounter++;
}
}
}
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
if (layerCounter >= layers.count) {
return;
}
CAShapeLayer *lineLayer = layers[layerCounter];
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
animation.duration = 0.200;
animation.fromValue = [NSNumber numberWithFloat:0.0f];
animation.toValue = [NSNumber numberWithFloat:1.0f];
animation.fillMode = kCAFillModeForwards;
lineLayer.hidden = NO;
[self.layer addSublayer:lineLayer];
[lineLayer addAnimation:animation forKey:@"strokeEndAnimation"];
layerCounter++;
}
@end如果对您有帮助，欢迎给一个star
demo