Swift learns the first demo, explaining some of the common knowledge points

/**

1. OC [UIView alloc] Initwithxxx:]

Swift UIView (XXX:)

Class name () = = Alloc/init equivalent

2. Class methods

OC [Uicolor Redcolor]

Swift uicolor.red

3. To access the properties of the current object, you can not use ' self. '

Recommendation: None, at the time of the compiler prompt, in addition, will have a better understanding of the ' context '

Reason: Closures (similar to block in OC) require the use of ' self. '

4. No '; '

The purpose of the '; ' is to split the statement, in Swift, which is not required by default. Multiple statements are required on a single line.

5. Enumeration type

OC Uibuttontypecontactadd

Swift. Contactadd

6. Monitoring methods

OC @selector

Swift #selector ()--3.0 There are no parameters do not need to add ': ', Debugging Plus ': ' is also possible, specifically see the following demo

"ClickMe", "ClickMe:"--2.0

7. Add document Comment shortcut key option + cmd +/

8. Display color panel colour + carriage return

9. Pre-compilation instructions are canceled

*/

Class Viewcontroller:uiviewcontroller

{

MARK:-View life cycle

MARK: View loading complete

Override Func Viewdidload ()

{

Super.viewdidload ()

multiple statements need '; ' In one line Separated. A single statement is not required by default '; '

Let A = 10; Let B = 20

Print ("a=\ (a); B=\ (b) ")

1. Create a View

Let V = UIView (Frame:cgrect (x:20, y:40, width:100, height:200))

Set Background color

V.backgroundcolor = uicolor.red//TODO: The new color should be set

V.backgroundcolor = #colorLiteral (red:0.7450980544, green:0.1568627506, blue:0.07450980693, alpha:1)

Add to Current View

View.addsubview (v)

2. Create a button

Let btn = UIButton (type:. Contactadd);

Btn.frame = CGRect (x:0, y:0, width:60, height:30)

Btn.center = Cgpoint (x:v.frame.size.width * 0.5, Y:v.frame.size.height * 0.5)

Method ClickMe the notation without parameters

Btn.addtarget (Self, Action: #selector (ClickMe), for:. Touchupinside)

Method ClickMe (Btn:uibutton) with parameters of the following two kinds of notation can be, debugging no problem found

Btn.addtarget (Self, Action: #selector (ClickMe1 (btn:)), for:. Touchupinside)

Btn.addtarget (Self, Action: #selector (CLICKME1), for:. Touchupinside);

V.addsubview (BTN)

Let LV = Uiimageview (Image: #imageLiteral (resourcename: "contact_checked")); Fixme: The image should be changed

View.addsubview (LV)

}

Func ClickMe () ()

{

Print (#function)

Print ("hehe")

}

Func clickMe1 (Btn:uibutton) ()

{

Print (#function)

Print ("hehe")

Print ("btn=\ (BTN)")

}

}

Swift learns the first demo, explaining some of the common knowledge points