IOS開發-畫直線

介紹兩種畫直線的方法:

(1)通過QuartzCore

(2)通過UIBezierPath

先建立一個自定義view:

然後在導入QuartzCore架構:

然後在m檔案打出下面代碼，三種函數都是同樣的效果：

#import "ZCView.h"
#import <QuartzCore/QuartzCore.h>

@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
{
    //擷取上下文
    CGContextRef context = UIGraphicsGetCurrentContext();
    //設定路徑
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, , );
    CGPathAddLineToPoint(path, NULL, , );

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

    //畫上去
    CGContextStrokePath(context);
}

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

    //設定路徑
    CGContextMoveToPoint(context, , );
    CGContextAddLineToPoint(context, , );

    //畫上去
    CGContextStrokePath(context);
}

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

    [path moveToPoint:CGPointMake(, )];

    [path addLineToPoint:CGPointMake(, )];

    [path stroke];
}
@end
           

在drawRect函數裡面調用不同的函數就行了，效果如下：