圆角，边框，阴影

CALayer *layer;
    layer = [CALayer layer];
    layer.frame = CGRectMake(100, 100, 100, 100);
    layer.cornerRadius = 10;//圆角
    layer.backgroundColor = [[UIColor yellowColor] CGColor];
    layer.borderColor = [[UIColor blueColor] CGColor];//边框
    layer.borderWidth = 5;
    layer.shadowOpacity = 0.5;//阴影
    layer.shadowOffset = CGSizeMake(3.0, 3.0);
    [self.view.layer addSublayer:layer];
    
    layer = [CALayer layer];
    layer.frame = CGRectMake(150, 150, 100, 100);
    layer.cornerRadius = 10;
    layer.backgroundColor = [[UIColor greenColor] CGColor];
    layer.borderWidth = 5;
    layer.shadowOpacity = 0.5;
    layer.shadowOffset = CGSizeMake(3.0, 3.0);
    [self.view.layer addSublayer:layer];
    
    layer = [CALayer layer];
    layer.frame = CGRectMake(200, 200, 100, 100);
    layer.cornerRadius = 10;
    layer.backgroundColor = [[UIColor blueColor] CGColor];
    layer.borderColor = [[UIColor redColor] CGColor];
    layer.borderWidth = 5;
    layer.shadowOpacity = 0.5;
    layer.shadowOffset = CGSizeMake(3.0, 3.0);
    [self.view.layer addSublayer:layer];