iOS 10.3后开放
[[UIApplication sharedApplication] setAlternateIconName:nil completionHandler:^(
}];
plist
<key>CFBundleIcons</key>
<dict>
<key>CFBundleAlternateIcons</key>
<dict>
<key>newIcon</key>
<dict>
<key>CFBundleIconFiles</key>
<array>
<string>newIcon</string>
</array>
<key>UIPrerenderedIcon</key>
<false/>
</dict>
</dict>
<key>CFBundlePrimaryIcon</key>
<dict>
<key>CFBundleIconFiles</key>
<array>
<string>Icon60X60</string>
</array>
</dict>
</dict>
