Merge pull request #45 from heyongjian/ios-style

merge pull request
wanghao:fix bug issue-23,can not scroll when pageiew less than one
Merge pull request #46 from heyongjian/ios-style

merge pull request
wanghao:issue-30,crash when you drag the icon on the desktop
wanghao:fix bug issue-26,crash when hide all apps
Merge pull request #140 from lwanghaol/ios-style

wanghao:fix bug issue-26,crash when hide all apps