Lan Yi Education Unboxing Application Lifecycle UIView page jump

The main content of today's study:

Unboxing://Convert the base data type to an object type (object before plus *), take the number out of the array, and turn the struct into the object type (the struct is not added *).

Application life cycle:

Run for the first time:

1. Already running complete 2. Activated

Exit by Pie:

1. Going to lose activation 2. Has entered the background

Press twice to return the pie:

1. Will enter the front desk 2. Activated

Common Uses of UIView:

Superview get the parent view of a control

SubView get all the child views

Addsubview Adding a child view

Insertsubview Insert a child view, you can add a child view to the specified location

Removefromsuperview Delete

[Self.view bringsubviewtofront:l]; bring a child view to the front of the display.

[Self.view exchangesubviewatindex:2 Withsubviewindex:3] Swap the display locations of sub-views 2 and 3

[V.alpha] Modifying the transparency of a control

V.hidden = YES Hide Control

V.backgroundcolor background Color

? Two ways to create a page:

1 Create a page through code, and storyboard irrelevant;

Secondviewcontroller *VC = [[Secondviewcontroller alloc]init];

2, create a page through storyboard, and storyboard about

Secondviewcontroller *VC = [self.storyboardinstantiateviewcontrollerwithidentifier:@ "SECONDVC"];

Jump to a page

[Self PRESENTVIEWCONTROLLER:VC animated:yes completion:nil];

Return from a page

[Self dismissviewcontrolleranimated:yes completion:nil];

Lan Yi Education Unboxing Application Lifecycle UIView page jump