iOS中常见的视图和图片处理示例详解

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

#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，谢谢大家对的支持。