iOS Line drawing tool(画线类, 直线和 折线)

DrawLine.h文件

注 : 本文在MRC下实现, 如果使用ARC注意内存管理部分

#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>@interface DrawLine : NSObject/* 折线 */+ (void)drawCenter:(UIImageView *)imageView withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a;/* 直线 */+ (void)drawLineCenter:(UIView *)view withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a;    /* param 1 : 画线部位      * param 2 : 起始点的X     * param 3 : 起始点的Y     * param 4 : 结束点的X     * param 5 : 结束点得Y     * param 6 ~ 9 : 线的颜色和透明度     */@end

DrawLine.m文件

#import "DrawLine.h"@implementation DrawLine+ (void)drawCenter:(UIImageView *)imageView withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a{    UIGraphicsBeginImageContext(imageView.frame.size);    [imageView.image drawInRect:CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height)];    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), width);  /* 线宽 */    CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), r, g, b, a);  /* 颜色 */    CGContextBeginPath(UIGraphicsGetCurrentContext());    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), Bx, By);  /* 起点坐标 */    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), Ex, Ey);   /* 终点坐标 */    CGContextStrokePath(UIGraphicsGetCurrentContext());    imageView.image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();}+ (void)drawLineCenter:(UIView *)view withBeginX:(CGFloat)Bx withBeginY:(CGFloat)By withEndX:(CGFloat)Ex withEndY:(CGFloat)Ey withLineWidth:(CGFloat)width withColorR:(CGFloat)r G:(CGFloat)g B:(CGFloat)b Alpha:(CGFloat)a{    UIImageView *imageView=[[UIImageView alloc] initWithFrame:view.frame];    [view addSubview:imageView];    view.backgroundColor = [UIColor clearColor];    UIGraphicsBeginImageContext(imageView.frame.size);    [imageView.image drawInRect:CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height)];    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), width);  /* 线宽 */    CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), r, g, b, a);  /* 颜色 */    CGContextBeginPath(UIGraphicsGetCurrentContext());    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), Bx, By);  /* 起点坐标 */    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), Ex, Ey);   /* 终点坐标 */    CGContextStrokePath(UIGraphicsGetCurrentContext());    imageView.image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    [imageView release];}@end

Git Demo : https://github.com/GyqGbusername/BrokenLineAndStraightLine.git