考研英语在线学习,帅哥窝图片,陈炳德的父亲
前言
众所周知在开发中不可避免的会遇到一些图片和视图的处理，我这里总结的这些只是我遇到的一些，以供下次使用查看。下面话不多说了，来一起看看详细的介绍吧。
图片的旋转
是uiimage的扩展类，直接使用uiimage的对象调用即可
uiimage
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#import <quartzcore/quartzcore.h>
#import <accelerate/accelerate.h>
@implementation uiimage (imagerotate)
-(uiimage *)imagerotateindegree:(float)degree{
//1.image-》context
size_t width = (size_t)(self.size.width *self.scale);
size_t height = (size_t)(self.size.height*self.scale);
size_t bytesperrow = width * 4;//表明每行图片数据字节
cgimagealphainfo alphainfo = kcgimagealphapremultipliedfirst;//alpha
//配置上下文参数
cgcontextref bmcontext = cgbitmapcontextcreate(null, width, height, 8, bytesperrow, cgcolorspacecreatedevicergb(), kcgbitmapbyteorderdefault | alphainfo);
if (!bmcontext) {
return nil;
}
cgcontextdrawimage(bmcontext, cgrectmake(0, 0, width, height), self.cgimage);
//2旋转
uint8 *data = (uint8*)cgbitmapcontextgetdata(bmcontext);
vimage_buffer src = {data,height,width,bytesperrow};
vimage_buffer dest = {data,height,width,bytesperrow};
pixel_8888 bgcolor = {0,0,0,0};
vimagerotate_argb8888(&src, &dest, null, degree, bgcolor, kvimagebackgroundcolorfill);
//3context-》uiimage
cgimageref rotateimageref = cgbitmapcontextcreateimage(bmcontext);
uiimage *rotateimage = [uiimage imagewithcgimage:rotateimageref scale:self.scale orientation:self.imageorientation];
return rotateimage;
}
@end
图片的裁剪
依然是uiimage的扩展类，直接使用uiimage的对象调用即可
uiimage
@implementation uiimage (imagecut)
-(uiimage *)imagecutsize:(cgrect)rect{
cgimageref subimageref = cgimagecreatewithimageinrect(self.cgimage, rect);
cgrect smallref = cgrectmake(0, 0, cgimagegetwidth(subimageref), cgimagegetheight(subimageref));
uigraphicsbeginimagecontext(smallref.size);
cgcontextref context = uigraphicsgetcurrentcontext();
cgcontextdrawimage(context, smallref, subimageref);
uiimage *image = [uiimage imagewithcgimage:subimageref];
uigraphicsendimagecontext();
return image;
}
@end
获取截屏
截屏是uiview的扩展类
uiview
@implementation uiview (imagescreenshot)
- (uiimage *)imagescreenshot
{
uigraphicsbeginimagecontext(self.frame.size);
[self.layer renderincontext:uigraphicsgetcurrentcontext()];
uiimage *imagenew = uigraphicsgetimagefromcurrentimagecontext();
uigraphicsendimagecontext();
return imagenew;
}
@end
使用方法
uiview
- (void)imagescreen{
uiimage *imagenew = [self.view imagescreenshot];
uiimagewritetosavedphotosalbum(imagenew, nil, nil, nil); //直接保存在相册里，要获取相册权限
}
图片比例处理
依然是uiimage的扩展类
uiimage
@implementation uiimage (imagescalesize)
- (uiimage *) scaleimage:(uiimage *)image toscale:(float)scalesize{
uigraphicsbeginimagecontext(cgsizemake(image.size.width * scalesize, image.size.height * scalesize));
[image drawinrect:cgrectmake(0, 0, image.size.width * scalesize, image.size.height * scalesize)];
uiimage *scaledimage = uigraphicsgetimagefromcurrentimagecontext();
uigraphicsendimagecontext();
return scaledimage;
}
@end
view添加圆角
这里是uiview的扩展类，适用于所有的view，可以设置添加的位置
uiview
@implementation uiview (lscore)
/**
设置部分圆角 绝对布局
@param corners 需要设置为圆角的角 uirectcornertopleft|uirectcornertopright
@param radii 需要设置的圆角大小 cgsizemake(5.0, 5.0)
*/
- (void)addroundedcorners:(uirectcorner)corners withradii:(cgsize)radii{
uibezierpath *rounded = [uibezierpath bezierpathwithroundedrect:self.bounds byroundingcorners:corners cornerradii:radii];
cashapelayer *shape = [[cashapelayer alloc] init];
[shape setpath:rounded.cgpath];
self.layer.mask = shape;
}
/**
设置部分圆角 相对布局
@param corners 需要设置为圆角的角 uirectcornertopleft|uirectcornertopright
@param radii 需要设置的圆角大小 cgsizemake(5.0, 5.0)
@param rect 需要设置的圆角view的rect
*/
- (void)addroundedcorners:(uirectcorner)corners withradii:(cgsize)radii viewrect:(cgrect)rect{
uibezierpath *rounded = [uibezierpath bezierpathwithroundedrect:self.bounds byroundingcorners:corners cornerradii:radii];
cashapelayer *shape = [[cashapelayer alloc] init];
[shape setpath:rounded.cgpath];
self.layer.mask = shape;
}
@end
使用方法以uiimageview为例
uiimage
[image addroundedcorners:uirectcornertopleft|uirectcornertopright withradii:cgsizemake(20.0, 20.0)];
将颜色转为图片
uiimage
-(uiimage *)imageforcolor:(uicolor *)color{
cgrect rect = cgrectmake(0.0f, 0.0f, 10, 10);
uigraphicsbeginimagecontext(rect.size);
cgcontextref context = uigraphicsgetcurrentcontext();
cgcontextsetfillcolorwithcolor(context, [color cgcolor]);
cgcontextfillrect(context, rect);
uiimage *image = uigraphicsgetimagefromcurrentimagecontext();
uigraphicsendimagecontext();
return image;
}
图片添加系统滤镜
uiimage
-(uiimage *)blurryimage:(uiimage *)image
withblurlevel:(cgfloat)blur {
cicontext *context = [cicontext contextwithoptions:nil];
ciimage *inputimage = [ciimage imagewithcgimage:image.cgimage];
cifilter *filter = [cifilter filterwithname:@"cigaussianblur"
keysandvalues:kciinputimagekey, inputimage,
@"inputradius", @(blur),
nil];
ciimage *outputimage = filter.outputimage;
cgimageref outimage = [context createcgimage:outputimage
fromrect:[outputimage extent]];
return [uiimage imagewithcgimage:outimage];
}
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对移动技术网的支持。
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