动态更改icon

iOS10.3下,添加了新特性,可以动态更改icon.

UIApplication新增属性

//判断是否支持动态替换
@property (readonly, nonatomic) BOOL supportsAlternateIcons NS_EXTENSION_UNAVAILABLE("Extensions may not have alternate icons") API_AVAILABLE(ios(10.3), tvos(10.2));

//根据plist配置,替换自己想要的icon
- (void)setAlternateIconName:(nullable NSString *)alternateIconName completionHandler:(nullable void (^)(NSError *_Nullable error))completionHandler NS_EXTENSION_UNAVAILABLE("Extensions may not have alternate icons") API_AVAILABLE(ios(10.3), tvos(10.2));

//替换icon的时候根据该属性获取到当前被替换到显示的icon名称,例如你没换的时候就是nil,换了icon1,那么就显示icon1
@property (nullable, readonly, nonatomic) NSString *alternateIconName NS_EXTENSION_UNAVAILABLE("Extensions may not have alternate icons") API_AVAILABLE(ios(10.3), tvos(10.2));

替换方法

1.设置plist.在plist文件的'Icon files'(CFBundleIcons)下添加'CFBundleAlternateIcons'字段,与'Primary Icon'(CFBundlePrimaryIcon)平级.并填充icon信息.有多个就添加多个 key可以自定义,这个key是动态设置icon的唯一标识.

<key>CFBundleIcons</key>
<dict>
  <key>CFBundleAlternateIcons</key>
  <dict>
    <key>Icon1</key>
    <dict>
      <key>CFBundleIconFiles</key>
      <array>
        <string>Icon1</string>
      </array>
    </dict>
    <key>Icon2</key>
    <dict>
      <key>CFBundleIconFiles</key>
      <array>
        <string>watermark1_w</string>
      </array>
    </dict>
  </dict>
  <key>CFBundlePrimaryIcon</key>
  <dict>
    <key>CFBundleIconFiles</key>
    <array>
      <string>Icon-72</string>
    </array>
  </dict>
</dict>

2.icon图片要添加到资源中,大小没有要求,不一定是标准尺寸. 3.在需要更改icon的位置添加如下代码

    if (![[UIApplication sharedApplication] supportsAlternateIcons])
    {
        NSLog(@"不支持动态替换icon");
        return;
    }

    NSLog(@"icon not exist");
    [[UIApplication sharedApplication] setAlternateIconName:@"Icon1" completionHandler:^(NSError * _Nullable error)
    {
        if (error)
        {
          NSLog(@"%@",error);
        }
    }];

成功后系统会弹出alert提示更改图标成功.

• 注意这里的iconName不是图片名称,而是plist中设置的单个icon的key.

• 启动时调用此方法无效,会自动被cancle.

• 设置为nil时恢复默认图标