Merge pull request #175 from whuthm/ios-style

fix bug issue-41, when do not download online wallpaper ,the native wallpaper is null.
Merge pull request #177 from whuthm/ios-style

fix bug issue-42, upload file url changes.
Merge pull request #55 from heyongjian/ios-style

Ios style
Merge pull request #180 from whuthm/ios-style

fix bug issue-43,the appearance of notification icon is different.
Merge pull request #56 from heyongjian/ios-style

Ios style
wanghao:fix bug issue-44,solve messy display when backup
wanghao:fix bug issue-45,add the default file type
Merge pull request #183 from lwanghaol/ios-style

wanghao:fix bug issue-45,add the default file type
Merge pull request #87 from heyongjian/ios-style

Ios style