3.30 study Notes

To turn off the keyboard:

Self.num Resginfirstresponder;

Let's try to close see keyboard

Self.view Enditing:yes

. h file Public extension

Writing private extensions in. m File private extensions

Ibaction is essentially a void but one more connection.

OC is a dynamic language

Compile correctly but sometimes not run

UIView--Control--Button

Shift+commond + O

Modifying the state of a control

Frame Bounds Center

Members of struct properties for non-modifiable objects

Enumeration

Use enumerations instead of magic number

Macro # Kmove 20.0f

3.30 study Notes