IOS开发-画直线

介绍两种画直线的方法:
(1)通过QuartzCore
(2)通过UIBezierPath
先创建一个自定义view:

然后在导入QuartzCore框架:

然后在m文件打出下面代码，三种函数都是同样的效果：

#import "ZCView.h"
#import 

@implementation ZCView

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.

*/

- (void)drawRect:(CGRect)rect {
    [self drawLine3];
}

- (void)drawLine1
{
    //获取上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //设置路径
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 50, 50);
    CGPathAddLineToPoint(path, NULL, 200, 200);

    //添加路径
    CGContextAddPath(context, path);

    //画上去
    CGContextStrokePath(context);
}

- (void)drawLine2
{
    //获取上下文
    CGContextRef context = UIGraphicsGetCurrentContext();

    //设置路径
    CGContextMoveToPoint(context, 50, 50);
    CGContextAddLineToPoint(context, 200, 200);

    //画上去
    CGContextStrokePath(context);
}

- (void)drawLine3
{
    UIBezierPath *path = [UIBezierPath bezierPath];

    [path moveToPoint:CGPointMake(50, 50)];

    [path addLineToPoint:CGPointMake(200, 200)];

    [path stroke];
}
@end

在drawRect函数里面调用不同的函数就行了，效果如下：