版本记录
| 版本号 | 时间 |
|---|---|
| V1.0 | 2018.01.16 |
前言
很多时候我们都需要绘制圆环或者饼状图，可以静态直接显示，也有时候需要加上一定的动画效果。这一篇就简单的说一下动画效果，希望能帮助到大家，有不足的地方欢迎指正。
单色圆环的绘制
下面我们就看一下单色圆环的动画效果展示，还是先看代码。
1. ViewController
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//圆周
JJCircleView *circleView = [[JJCircleView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:circleView];
}
@end
2. JJCircleView.m
#import "JJCircleView.h"
@interface JJCircleView()
@property (nonatomic, strong) CAShapeLayer *arcLayer;
@end
@implementation JJCircleView
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor blackColor];
[self initUI];
}
return self;
}
#pragma mark - Object Private Function
- (void)initUI
{
[self drawRoundView:CGPointMake(200.0, 300.0) withStartAngle:0 withEndAngle:M_PI * 2 withRadius:100.0];
}
- (void)drawRoundView:(CGPoint)centerPoint withStartAngle:(CGFloat)startAngle withEndAngle:(CGFloat)endAngle withRadius:(CGFloat)radius
{
UIBezierPath *path = [UIBezierPath bezierPath];
[path addArcWithCenter:centerPoint radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
self.arcLayer = [CAShapeLayer layer];
self.arcLayer.path = path.CGPath;
self.arcLayer.strokeColor = [UIColor yellowColor].CGColor;
self.arcLayer.lineWidth = 2;
self.arcLayer.frame = self.bounds;
[self.layer addSublayer:self.arcLayer];
//动画显示圆则调用
[self drawLineAnimation:self.arcLayer];
}
- (void)drawLineAnimation:(CALayer*)layer
{
CABasicAnimation *bas = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
bas.duration = 3;
bas.fromValue = [NSNumber numberWithInteger:0];
bas.toValue = [NSNumber numberWithInteger:1];
[layer addAnimation:bas forKey:@"key"];
}
@end
下面看一下实现效果
彩色圆环的绘制
我们还是先看一下代码。
1. ViewController.m
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//饼状图
NSArray *dataArr = @[@0.2, @0.3, @0.4, @0.1];
NSArray *colorArr = @[[UIColor redColor], [UIColor magentaColor], [UIColor purpleColor], [UIColor blueColor]];
JJPieView *pieView = [[JJPieView alloc] initWithFrame:self.view.bounds dataItems:dataArr colorItems:colorArr];
[self.view addSubview:pieView];
}
@end
2. JJPieView.m
#import "JJPieView.h"
@interface JJPieView()
@property (nonatomic, assign) CGFloat total;
@property (nonatomic, strong) CAShapeLayer *bgCircleLayer;
@end
@implementation JJPieView
#pragma mark - Object Private Function
- (instancetype)initWithFrame:(CGRect)frame dataItems:(NSArray *)dataItems colorItems:(NSArray *)colorItems
{
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor whiteColor];
//1.pieView中心点
CGFloat centerWidth = self.bounds.size.width * 0.5;
CGFloat centerHeight = self.bounds.size.height * 0.5;
CGFloat centerX = centerWidth;
CGFloat centerY = centerHeight;
CGPoint centerPoint = CGPointMake(centerX, centerY);
CGFloat radiusBasic = centerWidth > centerHeight ? centerHeight : centerWidth;
//计算颜色占比总和
_total = 0.0f;
for (int i = 0; i < dataItems.count; i++) {
_total += [dataItems[i] floatValue];
}
//线的半径为扇形半径的一半，线宽是扇形半径，这样就能画出圆形了
//2.背景路径
CGFloat bgRadius = radiusBasic * 0.5;
UIBezierPath *bgPath = [UIBezierPath bezierPathWithArcCenter:centerPoint
radius:bgRadius
startAngle:-M_PI_2
endAngle:M_PI_2 * 3
clockwise:YES];
_bgCircleLayer = [CAShapeLayer layer];
_bgCircleLayer.fillColor = [UIColor clearColor].CGColor;
_bgCircleLayer.strokeColor = [UIColor lightGrayColor].CGColor;
_bgCircleLayer.strokeStart = 0.0f;
_bgCircleLayer.strokeEnd = 1.0f;
_bgCircleLayer.zPosition = 1;
_bgCircleLayer.lineWidth = 3.0;
_bgCircleLayer.path = bgPath.CGPath;
//3.子扇区路径
CGFloat otherRadius = radiusBasic * 0.5 - 3.0;
UIBezierPath *otherPath = [UIBezierPath bezierPathWithArcCenter:centerPoint
radius:otherRadius
startAngle:-M_PI_2 //从竖直方向开始，顺时钟方向转动
endAngle:M_PI_2 * 3 //结束角度，正向270度
clockwise:YES];
CGFloat start = 0.0f;
CGFloat end = 0.0f;
for (int i = 0; i < dataItems.count; i++) {
//4.计算当前end位置 = 上一个结束位置 + 当前部分百分比
end = [dataItems[i] floatValue] / _total + start;
//图层
CAShapeLayer *pie = [CAShapeLayer layer];
[self.layer addSublayer:pie];
pie.fillColor = [UIColor clearColor].CGColor;
if (i > colorItems.count - 1 || !colorItems || colorItems.count == 0) {//如果传过来的颜色数组少于item个数则随机填充颜色
CGFloat redValue = arc4random_uniform(255)/255.0;
CGFloat greenValue = arc4random_uniform(255)/255.0;
CGFloat blueValue = arc4random_uniform(255)/255.0;
pie.strokeColor = [UIColor colorWithRed:redValue green:greenValue blue:blueValue alpha:1.0].CGColor;
}
else {
pie.strokeColor = ((UIColor *)colorItems[i]).CGColor;
}
pie.strokeStart = start;
pie.strokeEnd = end;
pie.lineWidth = otherRadius * 2.0f;
pie.zPosition = 2;
pie.path = otherPath.CGPath;
//计算百分比label的位置
CGFloat centerAngle = M_PI * (start + end);
CGFloat labelCenterX = bgRadius * 1.2 * sinf(centerAngle) + centerX;
CGFloat labelCenterY = -bgRadius * 1.2 * cosf(centerAngle) + centerY;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, radiusBasic * 0.3f, radiusBasic * 0.3f)];
label.center = CGPointMake(labelCenterX, labelCenterY);
label.text = [NSString stringWithFormat:@"%ld%%",(NSInteger)((end - start + 0.005) * 100)];
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.layer.zPosition = 3;
[self addSubview:label];
//计算下一个start位置 = 当前end位置
start = end;
}
self.layer.mask = _bgCircleLayer;
//开始绘画
[self stroke];
}
return self;
}
- (void)stroke
{
//画图动画
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
animation.duration = 3;
animation.fromValue = @0.0f;
animation.toValue = @1.0f;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.removedOnCompletion = YES;
[_bgCircleLayer addAnimation:animation forKey:@"circleAnimation"];
}
@end
下面我们就看一下实现效果
饼状图的绘制
我们还是先看代码，这个代码和彩色圆环绘制的代码是一样的，只需要改动一个地方，如下所示。
_bgCircleLayer.lineWidth = radiusBasic;
下面看一下实现效果。
这个也是动态的显示的。
后记
未完，待续~~~
