【代码】将一张正方形头像裁剪为原型，并保存在沙盒中

来源：互联网发布：中箭mod 知乎编辑：程序博客网时间：2024/06/01 07:49

//创建一个图片

UIImage *image = [UIImageimageNamed:@"123"];

//获取一个和图片一样大小的上下文对象

UIGraphicsBeginImageContextWithOptions(image.size,NO, 0.0);

//获取上下文

CGContextRef ctx =UIGraphicsGetCurrentContext();

//***********绘制图形************

//定义圆心和坐标

CGPoint centerP = CGPointMake(image.size.width*0.5, image.size.height*0.5);

CGFloat radius = MIN(image.size.width*0.5, image.size.height*0.5);

//绘制一个图形路径

UIBezierPath *path = [UIBezierPathbezierPathWithArcCenter:centerP radius:radiusstartAngle:0 endAngle:M_PI*2clockwise:YES];

//添加到图形上下文中

CGContextAddPath(ctx, path.CGPath);

//裁剪图片

CGContextClip(ctx);

//做一个空心渲染

CGContextDrawPath(ctx,kCGPathStroke);

//将图片添加到上下文中

[image drawAtPoint:CGPointZero];

//从上下文中获取裁剪好的图片

UIImage* imageClip =UIGraphicsGetImageFromCurrentImageContext();

//创建一个正方形区域裁剪

CGFloat x = (image.size.width - radius*2)*0.5;

CGFloat y =(image.size.height - radius*2)*0.5;

CGFloat width = radius *2;

CGFloat height = width;

//将屏幕的点转换成像素

CGFloat scale = [UIScreenmainScreen].scale;

x *= scale;

y *= scale;

width *= scale;

height *= scale;

CGRect clipRect = CGRectMake(x, y, width, height);

//裁剪正方形区域的图片

CGImageRef cgimgcliped =CGImageCreateWithImageInRect(imageClip.CGImage, clipRect);

imageClip = [UIImage imageWithCGImage:cgimgcliped];

//关闭上下文路径

UIGraphicsEndImageContext();

//**************将图片保存到沙盒中*****************

//获取沙盒路径

NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES)lastObject];

NSString* filename = [docPathstringByAppendingPathComponent:@"111.png"];

NSLog(@"%@",docPath);

//将文件转换成二进制流文件

NSData* clipPng =UIImagePNGRepresentation(imageClip);

//将文件写入沙盒中的Document目录

[clipPng writeToFile:filename atomically:YES];

NSLog(@"写入成功");

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