iOS 更换桌面图标(setAlternateIconName后不弹出alert)

我自己使用的方法:

- (void)lc_setAlternateIconName:(NSString*)iconName
 {
     //anti apple private method call analyse
     if ([[UIApplication sharedApplication] respondsToSelector:@selector(supportsAlternateIcons)] &&
         [[UIApplication sharedApplication] supportsAlternateIcons])
     {
         NSMutableString *selectorString = [[NSMutableString alloc] initWithCapacity:40];
         [selectorString appendString:@"_setAlternate"];
         [selectorString appendString:@"IconName:"];
         [selectorString appendString:@"completionHandler:"];
         
         SEL selector = NSSelectorFromString(selectorString);
         IMP imp = [[UIApplication sharedApplication] methodForSelector:selector];
         void (*func)(id, SEL, id, id) = (void *)imp;
         if (func)
         {
             func([UIApplication sharedApplication], selector, iconName, ^(NSError * _Nullable error) {});
         }
     }
 }

注意事项
1.不要在Appdelegate.m中更换，如果要在Appdelegate.m更换则需要使用异步延时加载

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
       xxxxxx  // 更换图标
 });

2.icon资源文件需要在项目目录下，不能是Assets.xcassets中的图片，否则无效

3.supportsAlternateIcons只是检测是否能进行更换，并不能进行系统版本号判断，需要自己进行版本判断，要不然在低版本系统中会崩溃，比如：iOS7

可以参考:[https://www.jianshu.com/p/9c78f161eeb8]