ios 裁剪出一個(gè)圓形的頭像,,這樣的例子在簡書已經(jīng)很多了,我就不詳細(xì)的介紹了.今天我想講的是怎么裁剪出一個(gè)環(huán)形的圖片.廢話不多說:見代碼:
1:首先將一張圖片裁剪成圓形圖片,,
/**圓形圖片裁剪*/
- (UIImage *)wjf_circleImage?
{
//利用self生成一張圓形圖片
// 1.開啟圖形上下文
UIGraphicsBeginImageContextWithOptions(self.size,NO,0);
// 2.描述圓形路徑
UIBezierPath*path = [UIBezierPathbezierPathWithOvalInRect:CGRectMake(0,0,self.size.width,self.size.height)];
// 3.設(shè)置裁剪區(qū)域
[pathaddClip];
// 4.畫圖
[selfdrawAtPoint:CGPointZero];
// 5.取出圖片
UIImage*image =UIGraphicsGetImageFromCurrentImageContext();
// 6.關(guān)閉上下文
UIGraphicsEndImageContext();
returnimage;
}
2:用CGContextClearRect 的功能 制作環(huán)形圖片
- (UIImage*)getClearRectImage:(UIImage*)image{
UIGraphicsBeginImageContextWithOptions(image.size,NO,0.0f);
CGContextRefctx =UIGraphicsGetCurrentContext();
//默認(rèn)繪制的內(nèi)容尺寸和圖片一樣大,從某一點(diǎn)開始繪制
[imagedrawAtPoint:CGPointZero];
CGFloatbigRaduis = image.size.width/5;
CGRectcirleRect =CGRectMake(image.size.width/2-bigRaduis, image.size.height/2-bigRaduis, bigRaduis*2, bigRaduis*2);
//CGContextAddArc(ctx,image.size.width/2-bigRaduis,image.size.height/2-bigRaduis, bigRaduis, 0.0, 2*M_PI, 0);
CGContextAddEllipseInRect(ctx,cirleRect);
CGContextClip(ctx);
CGContextClearRect(ctx,cirleRect);
UIImage*newImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnnewImage;
}
如果你的圖片是正方形的話,就大功告成了,但是你的圖片是長方形呢???不用怕.
注:將長方形圖片變成正方形圖片:
-(UIImage*)getSquareImage:(UIImage
*)image RangeCGRect:(CGRect)range
centerBool:(BOOL)centerBool{
/*如若centerBool為Yes則是由中心點(diǎn)取mCGRect范圍的圖片*/
floatimgWidth = image.size.width;
floatimgHeight = image.size.height;
floatviewWidth =range.size.width;
floatviewHidth =range.size.height;
CGRectrect;
if(centerBool)
rect =CGRectMake((imgWidth-viewWidth)/2,
(imgHeight-viewHidth)/2,viewWidth,viewHidth);
else{
if(viewHidth
{
if(imgWidth<= imgHeight){
rect=CGRectMake(0,0,imgWidth, imgWidth*viewHidth/viewWidth);
}else{
floatwidth = viewWidth*imgHeight/viewHidth;
floatx = (imgWidth - width)/2;
if(x >0){
rect =CGRectMake(x,0, width, imgHeight);
}else{
rect=CGRectMake(0,0,imgWidth, imgWidth*viewHidth/viewWidth);
}
}
}else{
if(imgWidth<= imgHeight){
floatheight = viewHidth*imgWidth/viewWidth;
if(height < imgHeight){
rect =CGRectMake(0,0,imgWidth, height);
}else
{
rect =CGRectMake(0,0,viewWidth*imgHeight/viewHidth,imgHeight);
}
}else
{
floatwidth = viewWidth*imgHeight/viewHidth;
if(width < imgWidth)
{
floatx = (imgWidth - width)/2;
rect =CGRectMake(x,0,width, imgHeight);
}else
{
rect =CGRectMake(0,0,imgWidth, imgHeight);
}
}
}
}
CGImageRefSquareImageRef =
CGImageCreateWithImageInRect(image.CGImage,rect);
CGRectSquareImageBounds =CGRectMake(0,0,CGImageGetWidth(SquareImageRef),CGImageGetHeight(SquareImageRef));
UIGraphicsBeginImageContext(SquareImageBounds.size);
CGContextRefcontext =UIGraphicsGetCurrentContext();
CGContextDrawImage(context,SquareImageBounds,SquareImageRef);
UIImage* SquareImage = [UIImageimageWithCGImage:SquareImageRef];
UIGraphicsEndImageContext();
returnSquareImage;
}
當(dāng)然這是就用到了UIimage的size的屬性了.
CGSize size =yuanlai.size;
floatimageSize;
NSLog(@"size==height%f====width%f",size.height,size.width);
if(size.height>= size.width) {
imageSize = size.width;
}else{
imageSize = size.height;
}
有什么不對的地方,大家都提提意見...分享了一關(guān)于:繪圖詳解的文章:http://m.blog.csdn.net/article/details?id=51251717
