我们可以对绘制的Path进行分区。这两个属性的值在0~1之间，0代表Path的开始位置，1代表Path的结束位置。是一种线性递增关系。strokeStart默认值为0，strokeEnd默认值为1。这两个属性都支持动画。
比如说：strokeStart=0.1f; strokeEnd=0.7f则显示如下图所示
实现效果如下图所示：
具体实现代码：
按照步骤上代码：
/** * 根据跃动数字 * * 确定百分比 * 现在的跳动数字——>背景颜色变化 * */
#import <UIKit/UIKit.h>
@interface DashboardView : UIView
@property (nonatomic, strong) UIImage *bgImage;
@property (nonatomic, copy) void(^TimerBlock)(NSInteger);
/**
* 跃动数字刷新
*
*/
- (void)refreshJumpNOFromNO:(NSString *)startNO toNO:(NSString *)toNO;
@end
先列出一些基本变量和常量
#import "DashboardView.h"
#define degreesToRadians(x) (M_PI*(x)/180.0) //把角度转换成PI的方式
static const CGFloat kMarkerRadius = 5.f; // 光标直径
static const CGFloat kTimerInterval = 0.03; //定时器间隔
static const CGFloat kFastProportion = 0.9;
static const NSInteger MaxNumber = 1000; //进度条最大值
@interface DashboardView () {
CGFloat animationTime; //动画时间
NSInteger beginNO; //起始值
NSInteger jumpCurrentNO; //当前值
NSInteger endNO; //截止值
}
// 百分比 0 - 100 根据跃动数字设置
@property (nonatomic, assign) CGFloat percent; //百分比
@property (nonatomic, strong) CAShapeLayer *bottomLayer; // 进度条底色
@property (nonatomic, assign) CGFloat lineWidth; // 弧线宽度
@property (nonatomic, strong) UIImageView *markerImageView; // 光标
@property (nonatomic, strong) UIImageView *bgImageView; // 背景图片
@property (nonatomic, assign) CGFloat circelRadius; //圆直径
@property (nonatomic, assign) CGFloat startAngle; // 开始角度
@property (nonatomic, assign) CGFloat endAngle; // 结束角度
@property (nonatomic, strong) UILabel * showLable;//值显示标签
@property (nonatomic, strong) NSTimer * fastTimer; //定时器
@property (nonatomic, strong) NSTimer * slowTimer; //定时器
@property (nonatomic, assign) NSInteger intervalNum; //间隔数
@end
#pragma mark - Life cycle
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor clearColor];
self.circelRadius = self.frame.size.width - 10.f;
self.lineWidth = 2.f;
self.startAngle = -200.f;
self.endAngle = 20.f;
// 尺寸需根据图片进行调整
self.bgImageView.frame = CGRectMake(6, 6, self.circelRadius, self.circelRadius * 2 / 3);
self.bgImageView.backgroundColor = [UIColor clearColor];
[self addSubview:self.bgImageView];
//添加圆框
[self setupCircleBg];
//光标
[self setupMarkerImageView];
//添加跃动数字
[self setupJumpNOView];
}
return self;
}
- (void)setupCircleBg {
// 圆形路径
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.width / 2, self.height / 2)
radius:(self.circelRadius - self.lineWidth) / 2
startAngle:degreesToRadians(self.startAngle)
endAngle:degreesToRadians(self.endAngle)
clockwise:YES];
// 底色
self.bottomLayer = [CAShapeLayer layer];
self.bottomLayer.frame = self.bounds;
self.bottomLayer.fillColor = [[UIColor clearColor] CGColor];
self.bottomLayer.strokeColor = [[UIColor colorWithRed:206.f / 256.f green:241.f / 256.f blue:227.f alpha:1.f] CGColor];
self.bottomLayer.opacity = 0.5;
self.bottomLayer.lineCap = kCALineCapRound;
self.bottomLayer.lineWidth = self.lineWidth;
self.bottomLayer.path = [path CGPath];
[self.layer addSublayer:self.bottomLayer];
// 220 是用整个弧度的角度之和 |-200| + 20 = 220
// [self createAnimationWithStartAngle:degreesToRadians(self.startAngle)
// endAngle:degreesToRadians(self.startAngle + 220 * 1)];
}
- (void)setupMarkerImageView {
if (_markerImageView) {
return;
}
_markerImageView = [[UIImageView alloc] init];
_markerImageView.backgroundColor = [UIColor clearColor];
_markerImageView.layer.backgroundColor = [UIColor greenColor].CGColor;
_markerImageView.layer.shadowColor = [UIColor whiteColor].CGColor;
_markerImageView.layer.shadowOffset = CGSizeMake(0, 0);
_markerImageView.layer.shadowRadius = kMarkerRadius*0.5;
_markerImageView.layer.shadowOpacity = 1;
_markerImageView.layer.masksToBounds = NO;
self.markerImageView.layer.cornerRadius = self.markerImageView.frame.size.height / 2;
[self addSubview:self.markerImageView];
_markerImageView.frame = CGRectMake(-100, self.height, kMarkerRadius, kMarkerRadius);
}
- (void)setupJumpNOView {
if (_showLable) {
return;
}
CGFloat width = self.circelRadius / 2 + 20;
CGFloat height = self.circelRadius / 2;
CGFloat xPixel = self.bgImageView.left + (self.bgImageView.width - width)*0.5;//self.circelRadius / 4;
CGFloat yPixel = self.circelRadius / 4;
CGRect labelFrame = CGRectMake(xPixel, yPixel, width, height);
_showLable = [[UILabel alloc] initWithFrame:labelFrame];
_showLable.backgroundColor = [UIColor clearColor];
_showLable.textColor = [UIColor whiteColor];
_showLable.textAlignment = NSTextAlignmentCenter;
_showLable.font = [UIFont systemFontOfSize:70.f];
_showLable.text = [NSString stringWithFormat:@"%ld",jumpCurrentNO];
[self addSubview:_showLable];
}
#pragma mark - Animation
- (void)createAnimationWithStartAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle { // 光标动画
//启动定时器
[_fastTimer setFireDate:[NSDate distantPast]];
// 设置动画属性
CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
pathAnimation.duration = _percent * kTimerInterval;
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
pathAnimation.repeatCount = 1;
// 设置动画路径
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddArc(path, NULL, self.width / 2, self.height / 2, (self.circelRadius - kMarkerRadius / 2) / 2, startAngle, endAngle, 0);
pathAnimation.path = path;
CGPathRelease(path);
[self.markerImageView.layer addAnimation:pathAnimation forKey:@"moveMarker"];
}
#pragma mark - Setters / Getters
/**
* 开始动画 确定百分比
*
*/
- (void)refreshJumpNOFromNO:(NSString *)startNO toNO:(NSString *)toNO {
beginNO = 0;//[startNO integerValue];
jumpCurrentNO = 0;//[startNO integerValue];
endNO = [toNO integerValue];
_percent = endNO * 100 / MaxNumber;
NSInteger diffNum = endNO - beginNO;
if (diffNum <= 0) {
return;
}
if (diffNum < 100) {
_intervalNum = 5;
} else if (diffNum < 300) {
_intervalNum = 15;
} else if (diffNum <= MaxNumber) {
_intervalNum = 10;
}
NSLog(@"数字间隔：%ld",_intervalNum);
//数字
[self setupJumpThings];
//光标
[self createAnimationWithStartAngle:degreesToRadians(self.startAngle)
endAngle:degreesToRadians(self.startAngle + 220 * _percent / 100)];
}
- (void)setBgImage:(UIImage *)bgImage {
_bgImage = bgImage;
self.bgImageView.image = bgImage;
}
- (UIImageView *)bgImageView {
if (nil == _bgImageView) {
_bgImageView = [[UIImageView alloc] init];
}
return _bgImageView;
}
#pragma mark - 跃动数字
- (void)setupJumpThings {
animationTime = _percent * kTimerInterval;
self.fastTimer = [NSTimer timerWithTimeInterval:kTimerInterval*kFastProportion
target:self
selector:@selector(fastTimerAction)
userInfo:nil
repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_fastTimer forMode:NSRunLoopCommonModes];
//时间间隔 = （总时间 - 快时间间隔*变化次数）/ 再次需要变化的次数
//快时间
NSInteger fastEndNO = endNO * kFastProportion;
NSInteger fastJump = fastEndNO/_intervalNum;
if (fastJump % _intervalNum) {
fastJump++;
fastEndNO += _intervalNum;
}
CGFloat fastTTime = fastJump*kTimerInterval*kFastProportion;
//剩余应跳动次数
NSInteger changNO = endNO - fastEndNO;
NSInteger endJump = changNO / _intervalNum + changNO % _intervalNum;
//慢时间间隔
NSTimeInterval slowInterval = (animationTime - fastTTime) / endJump;
self.slowTimer = [NSTimer timerWithTimeInterval:slowInterval
target:self
selector:@selector(slowTimerAction)
userInfo:nil
repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_slowTimer forMode:NSRunLoopCommonModes];
[_fastTimer setFireDate:[NSDate distantFuture]];
[_slowTimer setFireDate:[NSDate distantFuture]];
}
#pragma mark 加速定时器触发事件
- (void)fastTimerAction {
if (jumpCurrentNO >= endNO) {
[self.fastTimer invalidate];
return;
}
if (jumpCurrentNO >= endNO * kFastProportion) {
[self.fastTimer invalidate];
[self.slowTimer setFireDate:[NSDate distantPast]];
return;
}
[self commonTimerAction];
}
#pragma mark 减速定时器触发事件
- (void)slowTimerAction {
if (jumpCurrentNO >= endNO) {
[self.slowTimer invalidate];
return;
}
[self commonTimerAction];
}
#pragma mark 计时器共性事件 - lable赋值 背景颜色变化
- (void)commonTimerAction {
if (jumpCurrentNO % 100 == 0 && jumpCurrentNO != 0) {
NSInteger colorIndex = jumpCurrentNO / 100;
dispatch_async(dispatch_get_main_queue(), ^{
if (self.TimerBlock) {
self.TimerBlock(colorIndex);
}
});
}
NSInteger changeValueBy = endNO - jumpCurrentNO;
if (changeValueBy/10 < 1) {
jumpCurrentNO++;
} else {
// NSInteger changeBy = changeValueBy / 10;
jumpCurrentNO += _intervalNum;
}
_showLable.text = [NSString stringWithFormat:@"%ld",jumpCurrentNO];
}
@end
