ios--Summary Series One

1.IBAction:

1> can guarantee that the method can be wired

2> equivalent to void

2.IBOutlet:

1> can ensure that attributes can be wired

3. Common errors

Setvalue:forundefinedkey:]: This class was not key value coding

The reason for the error is: the connection problem

Some suggestions for 4.XCODE5 start

The methods and properties used for wiring are declared in the class extension of the. m file, guaranteeing its encapsulation.

5.frame\center\bounds

1> frame: Can modify position and size

2> Center: Can modify position

3> bounds: Can modify the size (X\y is generally 0)

6.NSBundle

1> a nsbundle represents a folder, with NSBundle access to the corresponding folder

2> can access any resource in the software resource bundle using Mainbundle

Installation path for the 3> emulator application

/users/aplle/Resource Library/application Support/iphone simulator/7.1/applications

7.UIImageView and UIButton

1> Use occasions

* Uiimageview: If you only display pictures, do not need to listen to the image of the click

* UIButton: Both display the picture, but also listen to the image of the click

2> same: can display picture

3> different points

* UIButton can handle click events, Uiimageview cannot handle click events

* UIButton can display both picture and text

* UIButton can display two pictures at the same time

* UIButton inherits from Uicontrol, so events can be handled by default

* Uiimageview inherits from UIView, so events cannot be handled by default

8.Xcode Document Installation Path

/applications/xcode.app/contents/developer/documentation/docsets

9.Xcode Simulator Installation path

/applications/xcode.app/contents/developer/platforms/iphonesimulator.platform/developer/sdks

ios--Summary Series One