iOS开发实现UIImageView的分类

#import <foundation/foundation.h>
#import <uikit/uikit.h>
#import <quartzcore/quartzcore.h>
 
/**
 * 这个分类为uiimageview添加一些有用的方法
 */
@interface uiimageview (wlkit)
 
/**
 * 创建一个uiimageview
 *
 * @param image uiimageview的图片
 * @param rect uiimageview的坐标
 *
 * @return 返回一个uiimageview
 */
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image
                   frame:(cgrect)rect;
 
/**
 * 创建一个uiimageview
 *
 * @param image uiimageview的图片
 * @param size  uiimageview的大小
 * @param center uiimageview的中心
 *
 * @return 返回一个uiimageview
 */
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image
                    size:(cgsize)size
                   center:(cgpoint)center;
 
/**
 * 创建一个uiimageview
 *
 * @param image uiimageview的图片
 * @param center uiimageview的中心
 *
 * @return returns the created uiimageview
 */
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image
                   center:(cgpoint)center;
 
/**
 * create an uiimageview with an image and use it as a template with the given color
 *
 * @param image   uiimageview image
 * @param tintcolor uiimageview tint color
 *
 * @return returns the created uiimageview
 */
+ (instancetype _nonnull)imageviewwithimageastemplate:(uiimage *_nonnull)image
                      tintcolor:(uicolor *_nonnull)tintcolor;
 
/**
 * create a drop shadow effect
 *
 * @param color  shadow's color
 * @param radius shadow's radius
 * @param offset shadow's offset
 * @param opacity shadow's opacity
 */
- (void)setimageshadowcolor:(uicolor *_nonnull)color
           radius:(cgfloat)radius
           offset:(cgsize)offset
          opacity:(cgfloat)opacity;
 
/**
 * mask the current uiimageview with an uiimage
 *
 * @param image the mask uiimage
 */
- (void)setmaskimage:(uiimage *_nonnull)image;
 
@end

#import "uiimageview+wlkit.h"
 
@implementation uiimageview (wlkit)
 
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image frame:(cgrect)rect
{
  uiimageview *_image = [[uiimageview alloc] init];
  [_image setframe:rect];
  [_image setimage:image];
  return _image;
}
 
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image size:(cgsize)size center:(cgpoint)center
{
  uiimageview *_image = [[uiimageview alloc] init];
  [_image setframe:cgrectmake(0, 0, size.width, size.height)];
  [_image setimage:image];
  [_image setcenter:center];
  return _image;
}
 
+ (instancetype _nonnull)imageviewwithimage:(uiimage *_nonnull)image center:(cgpoint)center
{
  uiimageview *_image = [[uiimageview alloc] init];
  [_image setframe:cgrectmake(0, 0, image.size.width, image.size.height)];
  [_image setimage:image];
  [_image setcenter:center];
  return _image;
}
 
+ (instancetype _nonnull)imageviewwithimageastemplate:(uiimage *_nonnull)image tintcolor:(uicolor *_nonnull)tintcolor
{
  uiimageview *_image = [[uiimageview alloc] init];
  image = [image imagewithrenderingmode:uiimagerenderingmodealwaystemplate];
  [_image setimage:image];
  [_image settintcolor:tintcolor];
  return _image;
}
 
- (void)setimageshadowcolor:(uicolor *_nonnull)color radius:(cgfloat)radius offset:(cgsize)offset opacity:(cgfloat)opacity
{
  self.layer.shadowcolor = color.cgcolor;
  self.layer.shadowradius = radius;
  self.layer.shadowoffset = offset;
  self.layer.shadowopacity = opacity;
  self.clipstobounds = no;
}
 
- (void)setmaskimage:(uiimage *_nonnull)image
{
  calayer *mask = [calayer layer];
  mask.contents = (id)[image cgimage];
  mask.frame = cgrectmake(0, 0, self.frame.size.width, self.frame.size.height);
  self.layer.mask = mask;
  self.layer.maskstobounds = yes;
}
 
- (void)setalpha:(cgfloat)alpha
{
  if ([self.superview iskindofclass:[uitableview class]]) {
    if (self.superview.tag == 836913) {
      if (alpha == 0 && self.autoresizingmask == uiviewautoresizingflexibleleftmargin) {
        if (self.frame.size.width < 10 && self.frame.size.height > self.frame.size.width) {
          uiscrollview *sc = (uiscrollview*)self.superview;
          if (sc.frame.size.height < sc.contentsize.height) {
            [super setalpha:0.5];
            return;
          }
        }
      }
    }
    
    if (self.superview.tag == 836914) {
      if (alpha == 0 && self.autoresizingmask == uiviewautoresizingflexibletopmargin) {
        if (self.frame.size.height < 10 && self.frame.size.height < self.frame.size.width) {
          uiscrollview *sc = (uiscrollview*)self.superview;
          if (sc.frame.size.width < sc.contentsize.width) {
            return;
          }
        }
      }
    }
  }
  
  [super setalpha:alpha];
}
@end