iOS开发_给圆角按钮添加阴影

@interface GC_Demo_Controller ()

@property(nonatomic, strong) CALayer *gc_layer;
@property(nonatomic, strong) Basic_Button *button;

@end

@implementation GC_Demo_Controller

- (void)viewDidLoad {
    [super viewDidLoad];

    self.title = @"";
    self.navigationItem.rightBarButtonItems = @[];

    // 创建阴影层级
    CALayer *layer = [CALayer layer];
    // 这个必须设置
    layer.backgroundColor = HEX_RGB(0x000000).CGColor;
    // 阴影颜色
    layer.shadowColor = HEX_RGB(0x99aabb).CGColor;
    // 阴影偏移程度
    layer.shadowOffset = CGSizeMake(5, 5);
    // 阴影的透明度
    layer.shadowOpacity = 0.5;
    _gc_layer = layer;
    // 添加层级
    [self.view.layer addSublayer:layer];
    
    // 给按钮添加阴影就得将按钮添加到阴影之上
    Basic_Button *button = [[Basic_Button alloc] init];
    [self.view addSubview:button];
    // 设置按钮背景图片
    UIImage *gc_Image = GC_C_Image(HEX_RGB(0x234567));
    [button setBgImage:gc_Image forState:UIControlStateNormal];
    _button = button;
}

- (void)viewWillLayoutSubviews {
    [super viewWillLayoutSubviews];

    _gc_layer.frame = CGRectMake(100, 200, 200, 30);
    _button.frame = _gc_layer.frame;
    // 阴影圆角
    _gc_layer.cornerRadius = 15;
    CHViewBorderRadius(_button, _button.height / 2, 0, Clear_Color);
}