自定义划线方法

#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];

    imageView.frame = CGRectMake(view.frame.origin.x, view.frame.origin.y, 500, view.frame.size.height);

    

    [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();

    

}

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