1.system UI
in ios,the system UI tends to be more standardized.
2.IBAction
the method in Controller should add the "IBAction"
drag a line link the widget and the dot in code area
3.@property IBOutlet
UI widget we all use the @property( ,weak) IBOutlet
4.widget's properties
so much, don't have to master them right now
5.plist
ios store file,a little like the .xml in Android
6.xib
in Android we can write a cell part in xml,in ios we usually use the xib
7.storybord
the essence of storybord is just a xml file