UIButton的阴影图层效果

Question

我创造与此类似图像的UIButton：

我尝试了用下面的代码：

+(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]; 
} 

我能做到这一点：

我想让按钮上的阴影效果只保留在底部。

我该如何达到预期的效果。

Answer 1

只有您的代码问题是您错过了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]; 

Answer 2

也许你应该设置视图的背景颜色，所以标题没有阴影，你可以设置view.layer.shadowOffset来改变阴影尺寸。

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 3

前瞻：

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];