标签：
重写drawRect方法
准备：继承UIView的子类
1. .h文件
//
// DashesLineView.h
// inface
//
// Created by huangzengsong on 15/5/11.
// Copyright (c) 2015年 huangzs. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface DashesLineView : UIView
@property(nonatomic)CGPoint startPoint;//虚线起点
@property(nonatomic)CGPoint endPoint;//虚线终点
@property(nonatomic,strong)UIColor* lineColor;//虚线颜色
@end
2. .m文件
//
// DashesLineView.m
// inface
//
// Created by huangzengsong on 15/5/11.
// Copyright (c) 2015年 huangzs. All rights reserved.
//
#import "DashesLineView.h"
@implementation DashesLineView
- (id)initWithFrame:(CGRect)frame
{
self= [super initWithFrame:frame];
if(self) {
// Initialization code
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
CGContextRef context =UIGraphicsGetCurrentContext();
CGContextBeginPath(context);
CGContextSetLineWidth(context,1);//线宽度
CGContextSetStrokeColorWithColor(context,self.lineColor.CGColor);
CGFloat lengths[] = {1,2};//先画4个点再画2个点
CGContextSetLineDash(context,0, lengths,2);//注意2(count)的值等于lengths数组的长度
CGContextMoveToPoint(context,self.startPoint.x,self.startPoint.y);
CGContextAddLineToPoint(context,self.endPoint.x,self.endPoint.y);
CGContextStrokePath(context);
CGContextClosePath(context);
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code
}
*/
@end
3.调用时
self.DashLineView.startPoint=CGPointMake(0, 1);
self.DashLineView.endPoint=CGPointMake(
[[UIScreen mainScreen] bounds].size.width
-40, 1);
self.DashLineView.lineColor=
[UIColor colorWithRed:28.0/255.0 green:160.0/255.0 blue:229.0/255.0 alpha:1]
;
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原文地址：http://www.cnblogs.com/huangzs/p/4494940.html
