76-圆形裁剪(指定图片裁剪为圆形)，添加UIImage分类，两个类方法，实现圆形裁剪

来源：互联网发布：lodash 知乎编辑：程序博客网时间：2024/05/20 11:47

// UIImage+cilcleImage.m
//  圆形裁剪,常用于设置头像

#import "UIImage+cilcleImage.h"

//给UIImage添加分类，两个类方法，实现圆形裁剪
@implementation UIImage (cilcleImage)

/**
*  头像圆形裁剪(周围带圆环)
*
*  @param borderWidth 圆环宽度
*  @param borderColor 圆环颜色
*  @param image       想要裁剪的图片
*
*  @return 裁剪完成的图片
*/
+(UIImage *) cilcleImageWithCilcleBorderWidth:(CGFloat) borderWidth borderColor:(UIColor *) borderColor image:(UIImage *)image
{
    //UIImage *image=[UIImage imageNamed:@"阿狸头像"];
    //设置大圆的rect
    CGFloat w=image.size.width+2 *borderWidth;
    CGFloat h=image.size.width+2 *borderWidth;
    CGRect bigCirCleRect=CGRectMake(0, 0, w, h);

    //1.开启上下文
    UIGraphicsBeginImageContextWithOptions(bigCirCleRect.size, NO, 0);

    //2.拼接路径

    //2.1 绘制大圆
    UIBezierPath *bigpath=[UIBezierPath bezierPathWithOvalInRect:bigCirCleRect];
    //设置圆环颜色
    [borderColor set];
    //填充圆环
    [bigpath fill];

    //2.2 设置裁剪区域
    CGRect clipRect=CGRectMake(borderWidth, borderWidth, image.size.width, image.size.height);
    //2.3 描述裁剪区域路径
    UIBezierPath *clipPath=[UIBezierPath bezierPathWithOvalInRect:clipRect];
    //根据裁剪路径裁剪
    [clipPath addClip];

    //3.绘制图片
    [image drawAtPoint:CGPointMake(borderWidth, borderWidth)];

    //4.获取图片
    image=UIGraphicsGetImageFromCurrentImageContext();

    //5.关闭上下文
    UIGraphicsEndImageContext();

    return image;
}

/**
*  普通头像圆形裁剪
*
*  @param image 想要裁剪的图片
*
*  @return 裁剪完成的图片
*/
+(UIImage *) circleImage:(UIImage *)image
{
    //0.加载图片
    //UIImage *img=[UIImage imageNamed:@"阿狸头像"];

    //1.开启位图上下文
    UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);

    //2.设置裁剪区域(图片大小)
    //默认只会影响到后面的东西,会把超出裁剪区域的范围裁剪掉
    CGRect circeRect=CGRectMake(0, 0, image.size.width, image.size.height);

    //3.描述圆形路径
    UIBezierPath *path=[UIBezierPath bezierPathWithOvalInRect:circeRect];

    //4.根据圆形路径裁剪路径
    [path addClip];

    //5.绘制图片
    [image drawAtPoint:CGPointZero];

    //6.获取图片(把当前上下文转换成图片)
    image=UIGraphicsGetImageFromCurrentImageContext();

    //7.关闭上下文
    UIGraphicsEndImageContext();

    return image;
}

@end

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