实现iOS应用图标右上角数字badge number提醒

能够在ios桌面的程序icon右上角显示数字(badge number)
[UIApplicationsharedApplication] .applicationIconBadgeNumber =  3 ;         
//右上角badge number 设置成3

[UIApplicationsharedApplication] .applicationIconBadgeNumber = 0;                     
/ /消掉右上角badge number

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