<极客学院>视频教程学习笔记－iOS中CALayer的使用

 1 #import "ViewController.h"
 2 
 3 @interface ViewController ()
 4 //2单独创建一个layer
 5 @property (nonatomic,strong) CALayer *layer;
 6 
 7 @end
 8 
 9 @implementation ViewController
10 
11 - (void)viewDidLoad {
12     [super viewDidLoad];
13     //1创建一个容器View
14     UIView *containerview = [[UIView alloc] initWithFrame:CGRectMake(50, 200, 100, 3)];
15     containerview.backgroundColor = [UIColor blueColor];
16     [self.view addSubview:containerview];
17     //3使用并设置layer的相关值
18     self.layer = [CALayer layer];
19     [self.layer setFrame:CGRectMake(0, 0, 50, 3)];
20     self.layer.backgroundColor = [UIColor redColor].CGColor;//别忘了最后面还要一个  .CGColor
21     [containerview.layer addSublayer:self.layer];
22 }
23 
24 
25 @end