UIButton 阴影图层效果

Question

我正在创建一个类似于此图像的 UIButton：

我用下面的代码试了一下：

+(void)createShadowOnView:(UIView *)view color:(UIColor *)color width:(CGFloat)width height:(CGFloat)height shadowOpacity:(CGFloat)shadowOpacity andShadowRadius:(CGFloat)radius{

    view.layer.masksToBounds = NO;
    view.layer.shadowColor = color.CGColor;
    view.layer.shadowOffset = CGSizeMake(width,height);
    view.layer.shadowOpacity = shadowOpacity;
    [view.layer setShadowRadius:radius];
}

我能够做到这一点：

我希望 Button 的阴影效果只保留在底部。

我怎样才能达到预期的效果。

Answer 1

也许你应该设置视图的背景颜色，这样标题就没有阴影了，你可以设置view.layer.shadowOffset来改变阴影大小。

UIButton *customBTn = [UIButton buttonWithType:UIButtonTypeCustom];
customBTn.backgroundColor = [UIColor whiteColor];
customBTn.frame = CGRectMake(100, 100, 200, 50);
[customBTn setTitle:@"Sign Up" forState:UIControlStateNormal];
[customBTn setTitleColor:[UIColor colorWithRed:1/255.0 green:168/255.0 blue:244/255.0 alpha:1.0] forState:UIControlStateNormal];
customBTn.layer.borderColor = [UIColor colorWithRed:1/255.0 green:168/255.0 blue:244/255.0 alpha:1.0].CGColor;
customBTn.layer.borderWidth = 2;
customBTn.layer.cornerRadius = 25;
customBTn.layer.shadowColor = [UIColor lightGrayColor].CGColor;
customBTn.layer.shadowOffset = CGSizeMake(0,8);
customBTn.layer.shadowOpacity = 0.9;
[self.view addSubview:customBTn];

输出：-

Answer 2

预览：

代码：

UIButton *buttonWithShadow = [UIButton buttonWithType:UIButtonTypeCustom];
[buttonWithShadow setFrame:CGRectMake(10.0f, 10.0f, 300.0f, 50.0f)];
[buttonWithShadow setTitle:@"SIGN UP" forState:UIControlStateNormal];
[buttonWithShadow setTitle:@"SIGN UP" forState:UIControlStateHighlighted];
[buttonWithShadow.titleLabel setFont:[UIFont boldSystemFontOfSize:15.0f]];
[buttonWithShadow setTitleColor:[UIColor colorWithRed:1.0f/255.0 green:168.0f/255.0 blue:244.0f/255.0 alpha:1.0f] forState:UIControlStateNormal];
    [buttonWithShadow setBackgroundColor:[UIColor whiteColor]];
[buttonWithShadow.layer setBorderColor:[UIColor colorWithRed:1.0f/255.0 green:168.0f/255.0 blue:244.0f/255.0 alpha:1.0f].CGColor];
[buttonWithShadow.layer setBorderWidth:2.0f];
[buttonWithShadow.layer setCornerRadius:(buttonWithShadow.frame.size.height / 2.0f)];
[buttonWithShadow.layer setShadowColor:[UIColor lightGrayColor].CGColor];
[buttonWithShadow.layer setShadowOpacity:0.3f];
[buttonWithShadow.layer setShadowRadius:0.0f];
[buttonWithShadow.layer setShadowOffset:CGSizeMake(0.0f,2.0f)];
[buttonWithShadow.layer setMasksToBounds:NO];
[self.view addSubview:buttonWithShadow];

Answer 3

您的代码唯一的问题是您没有为注册按钮设置背景颜色。使用此代码，

self.signUpButton.backgroundColor = [UIColor whiteColor];
[UIView createShadowOnView:self.signUpButton color:[UIColor lightGrayColor] width:0 height:2 shadowOpacity:0.3 andShadowRadius:0];

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