标签:style blog http io color ar os 使用 sp
转载注明 出处,谢谢。
使用CAShapeLayer与UIBezierPath可以实现不在view的drawRect方法中就画出一些想要的图形。
1.背景知识:
2.开始绘制:
这里绘制三个图形,圆形,环形,不规则多边形。
关键代码如下:
#import "ViewController.h" @interface ViewController () { //三个CAShapeLayer CAShapeLayer*circleLayer; CAShapeLayer*loopLayer; CAShapeLayer*polygonLayer; } @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //对三个CAShapeLayer进行初始化 circleLayer=[CAShapeLayer new]; circleLayer.frame=CGRectMake(0, 0, 160, 200); //fillColor和strokeColor的区别是 一个为填充色,一个为描边色 circleLayer.fillColor=[UIColor blueColor].CGColor; circleLayer.strokeColor=[UIColor redColor].CGColor; loopLayer=[CAShapeLayer new]; loopLayer.frame=CGRectMake(160, 0, 160, 200); loopLayer.fillColor=nil; loopLayer.lineCap = kCALineCapRound; loopLayer.strokeColor=[UIColor cyanColor].CGColor; loopLayer.lineWidth=10; polygonLayer=[CAShapeLayer new]; polygonLayer.frame=CGRectMake(0, 200, 320, 200); polygonLayer.fillColor=nil; polygonLayer.strokeColor=[UIColor greenColor].CGColor ; //添加到主视图的layer中 [self.view.layer addSublayer:circleLayer]; [self.view.layer addSublayer:loopLayer]; [self.view.layer addSublayer:polygonLayer]; } //环形按钮触发的事件 - (IBAction)buttonAction:(id)sender { UIBezierPath*path=[UIBezierPath bezierPathWithArcCenter:CGPointMake(80, 80) radius:80 startAngle:0 endAngle:M_PI*2 clockwise:YES]; // [[UIColor redColor]setStroke]; loopLayer.path=path.CGPath; } //圆 - (IBAction)circle:(id)sender { UIBezierPath*path=[UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 160, 160) cornerRadius:80]; circleLayer.path=path.CGPath; } //多边形 - (IBAction)polygon:(id)sender { UIBezierPath*path=[UIBezierPath new]; [path moveToPoint:CGPointMake(0, 0)]; [path addLineToPoint:CGPointMake(0, 50)]; [path addLineToPoint:CGPointMake(50, 50)]; [path addLineToPoint:CGPointMake(150, 50)]; [path addLineToPoint:CGPointMake(200, 100)]; [path closePath];//将起点与结束点相连接 polygonLayer.path=path.CGPath; } @end
点击按钮后,图形显示,效果图:
UIBezierPath+CAShapeLayer 绘制自定义图形
标签:style blog http io color ar os 使用 sp
原文地址:http://blog.csdn.net/zhaoyabei/article/details/40820745