IOS Calayer Use

I. INTRODUCTION

1.CALayer is generally used as a container for UIView

2. is a layer architecture for managing picture vectors

3. Directly modify the created Calayer to trigger the hidden animation

4.UIView Calayer animation must show trigger

Two. Application

1. Modifying the layer of UIView is equivalent to modifying the UIView directly, for example

UIView *test = [[UIView alloc] initwithframe:cgrectmake (100, 100, 200, +)];test.layer.frame = CGRectMake Test.layer.backgroundColor = [Uicolor Redcolor]. Cgcolor; [Self.view Addsubview:test]; NSLog (@ "%f%f", Test.frame.size.width, Test.frame.size.height); The result is printed as a modified property value 200 200

2. Modify the created Calayer to trigger a hidden animation

-  (void) viewdidload {    [super viewdidload];    //  Do any additional setup after loading the view, typically  from a nib.    //  Creating a custom View    uiview *contain  = [[uiview alloc] initwithframe:cgrectmake (50, 50, 100, 4)];     contain.layer.borderWidth = 1; //  Show Borders          //  custom layer, only the layer you create automatically creates animation effects     _layer = [[CALayer  Alloc] init];    _layer.frame = cgrectmake (0, 0, 0, 4);     _layer.backgroundcolor = [uicolor redcolor]. cgcolor;    //  Join Layer    [contain.layer addsublayer:_layer] ;     [self.view addsubview:contaiChange action after n];        // 3 seconds     [self  Performselector: @selector (Changelayer)  withobject:nil afterdelay:3.0f];}   Modify properties to automatically trigger hidden animation-  (void) changelayer {    _layer.frame =  CGRectMake (0, 0, 50, 4); //  show Half}

IOS Calayer Use