ios绘图.docx

// // ViewController.m // 01-带有边框的图片裁剪 // // Created by Gavin on 15/9/14. // Copyright (c) 2015年 Gavin. All rights reserved. // #import ViewController.h #import UIImage+image.h @interface ViewController () @property (weak, nonatomic) IBOutlet UIImageView *imageV; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //1.加载 UIImage *image = [UIImage imageNamed:@阿狸头像]; //2.边框宽度 CGFloat borderW = 10; //3.开启图片上下文. CGSize size = CGSizeMake(image.size.width + 2 * borderW, image.size.height + 2 * borderW); UIGraphicsBeginImageContextWithOptions(size, NO, 0); //4.先描述一个大圆,设为填充 UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, size.width, size.height)]; [[UIColor redColor] set]; [path fill]; //5.再添加一个小圆,把小圆设裁剪区域 path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(borderW, borderW, image.size.width, image.size.height)]; [path addClip]; //6.把图片给绘制上下文. [image drawInRect:CGRectMake(borderW, borderW, image.size.width, image.size.height)]; //7.生成一张新的图片 UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); //8.关闭上下文. UIGraphicsEndImageContext(); // 抽取出来的功能 self.imageV.image = [UIImage imageWithBorderWidth:10 borderColor:[UIColor greenColor] image:[UIImage imageNamed:@阿狸头像]]; } - (UIImage *)imageWithBorderWidth:(CGFloat)borderW borderColor:(UIColor *)color image:(UIImage *)image{ //3.开启图片上下文. CGSize size = CGSizeMake(image.size.width + 2 * borderW, image.size.height + 2 * borderW); UIGraphicsBeginImageContextWithOptions(size, NO, 0); //4.先描述一个大圆,设为填充 UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, size.width, size.height)]; //设置边框的颜色 [color set]; [path fill]; //5.再添加一个小圆,把小圆设裁剪区域 path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(borderW, borderW, image.size.width, image.size.height)]; [path addCli