ios中画出直线

本人项目中  在地图 类 后面新建了个UIView类

。h文件

#import <UIKit/UIKit.h>

#define _WEITH 320/3

#define _HEIGHT 330/3

@interface view : UIView

@end

。m文件

//

//  view.m

//  122CheZhu01

//

//  Created by xumin on 7/8/13.

//  Copyright (c) 2013 xumin. All rights reserved.

//

#import "view.h"

@implementation view

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self) {

        self.backgroundColor = [UIColor clearColor];

    }

    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();

    

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    

    

    CGContextMoveToPoint(context, 0, _HEIGHT);

    CGContextAddLineToPoint(context, 320, _HEIGHT);

    CGContextMoveToPoint(context, 0, _HEIGHT*2);

    CGContextAddLineToPoint(context, 320, _HEIGHT*2);

    CGContextMoveToPoint(context, _WEITH, 0);

    CGContextAddLineToPoint(context, _WEITH, self.frame.size.height);

    CGContextMoveToPoint(context, _WEITH*2, 0);

    CGContextAddLineToPoint(context, _WEITH*2, self.frame.size.height);

    CGContextStrokePath(context);

    CGContextClosePath(context);

}

@end

画出9 宫格的直线