CALayers详解

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    UIView *viewSample = [[UIView alloc] init];
    [self.view addSubview:viewSample];
 
    viewSample.backgroundColor = [UIColor greenColor];
    viewSample.frame = CGRectMake(100, 100, 400, 400);
    
    
    //Test 1 阴影
    //viewSample.layer.shadowPath = [UIBezierPath bezierPathWithRect:viewSample.bounds].CGPath;
    viewSample.layer.shadowPath = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, 400, 400)].CGPath;
    viewSample.layer.masksToBounds = NO;
    viewSample.layer.shadowOffset = CGSizeMake(10, 10);
    viewSample.layer.shadowRadius = 5;
    viewSample.layer.shadowOpacity = 0.5;
    
    //Test 2 边框
    viewSample.layer.borderWidth = 2;
    viewSample.layer.borderColor = [[UIColor redColor] CGColor];
    
    //Test 3 masksToBounds
    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0,0, 500, 500)];
    btn.backgroundColor = [UIColor lightGrayColor];
    //[viewSample addSubview:btn];
    //viewSample.layer.masksToBounds = true;
    
    
    //Test 4 bounds
    //viewSample.layer.bounds = CGRectMake(200, 200, 500, 500);
 
    
    //Test 5
    viewSample.layer.opacity = 0.5;
    viewSample.layer.cornerRadius = 5;
}