iOS basic Knowledge--01

First day:

1. If a method , only need to click Button Trigger , do not need to call elsewhere , then You do not need to declare in . h only to be implemented in . M

2. for controls ( Properties ) that need to be used only in Viewcontroller , We generally declare that in a class extension,UI controls , all using the weakui control need to be wired , you also need to add iboutlet

3. Convert the text of the textbox to a number: [self.field.text intvalue];

4. Close the keyboard: cancels the first response , cancels the focus of the text box

Method 1: need to find the corresponding Control , to invoke the method , more cumbersome

Self.field1 Resignfirstresponder];

Way 2: Cancel directly Controller's View the editing state

[self. View endediting:YES];

5. UI interface , We can see all the things that are UIView

All controls , either directly or indirectly, inherit UIView

UIView is a container , you can add other controls inside.

we can pass UIView to make some of the purest interfaces.

6. I. A . Common Properties of UIView

* Superview: Parent Control

* Addsubview: adding child controls in a way that uses code

* Frame Properties : CGRect type : determines the position and size of the control

two . use of Uicolor

    * can be directly through the class method get a solid color For example red Green and so on [uicolor redcolor][uicolor Blackcolor]

* available through [uicolorcolorwithred:randomr green:randomg blue:randomb alpha:1]; to create a color through Red , Green , Blue Three kinds to make a new color.

* (View) the color :

column: float randomr =arc4random_uniform (255)/255.0;

[Uicolor colorwithred:randomr Green:randomGblue:randomB alpha:1];

7. You cannot directly modify the frame Property of a control to save the frame Property on a temporary variable , and then modify , in the assignment.

8. I. A. Animate the way you modify Frame one -tail animation , If you set the animation time , You can not submit , This animation way , not much to use. , General use Block .

* Start Animation: [UIView BeginAnimations:nilcontext:nil];

* modify various properties of an animation : [UIView Setanimationduration:3];

[UIView Setanimationdelay:2];

* assign a value back: Creaeview.frame=oldframe;

* Commit animations: [UIView commitanimations];

two. animate the way to modify frame-block animations More Select this one way to make

* Write code in block that requires animation :

[UIView Animatewithduration:3 animations:^{

Creaeview.frame=oldframe;

}];

9. I. A . note Point of the button

* Image property can set the picture of the button so that the picture with the text peer

* The default type of the button is system when the image is set Custom We generally use custom

* set background picture , is at the back of the text

* buttons are available in a number of States

default : You can set a style

Click to highlighted: You can set a different style

selected: need to use code settings

Disable: disabled State

* Use code to create a button if you want to set the style of different states , you need to set up separately , The code is large

* Add a Click event using code Addtarget Method: [btn addTarget: Self action:@selector(dosomething) forControlEvents: UIControlEventTouchUpInside];

* When creating a button General Selection directly Create and set It's type : Create UIbutton :

UIButton *btn =[uibuttonbuttonwithtype:uibuttontypecustom];

two . the way the picture resources are located

* can be placed directly in the project

* put in assets.xcassets , note : xcode6 : Image.xcassets

iOS basic Knowledge--01