[英]How to add a drop shadow to a UIButton?
我想为UIButton添加一个投影。 我试图使用self.layer.shadow *属性。 这些属性在UIView中有效,但它们在UIButton中的表现不同。 如果我能得到任何指针来绘制投影,我将非常感激。 谢谢!
self.layer.cornerRadius = 8.0f;
self.layer.masksToBounds = YES;
self.layer.borderWidth = 1.0f;
self.layer.shadowColor = [UIColor greenColor].CGColor;
self.layer.shadowOpacity = 0.8;
self.layer.shadowRadius = 12;
self.layer.shadowOffset = CGSizeMake(12.0f, 12.0f);
问题中只有一个小错误导致阴影无法显示: masksToBounds:YES
也掩盖阴影! 这是正确的代码:
self.layer.cornerRadius = 8.0f;
self.layer.masksToBounds = NO;
self.layer.borderWidth = 1.0f;
self.layer.shadowColor = [UIColor greenColor].CGColor;
self.layer.shadowOpacity = 0.8;
self.layer.shadowRadius = 12;
self.layer.shadowOffset = CGSizeMake(12.0f, 12.0f);
不幸的是,这意味着我们无法在没有技巧的情况下屏蔽内容并同时拥有阴影。
记得#import <QuartzCore/QuartzCore.h>
。
如果您使用的是UIButton
这是一个简单的解决方案:
#import <QuartzCore/QuartzCore.h>
button.imageView.layer.cornerRadius = 7.0f;
button.layer.shadowRadius = 3.0f;
button.layer.shadowColor = [UIColor blackColor].CGColor;
button.layer.shadowOffset = CGSizeMake(0.0f, 1.0f);
button.layer.shadowOpacity = 0.5f;
button.layer.masksToBounds = NO;
刚刚开始工作,并认为值得发布。 希望有帮助!
这是一个不仅创建投影的子类,而且当按下它时按钮会动画下来。
//
// ShadowButton.h
#import <Foundation/Foundation.h>
@interface ShadowButton : UIButton {
}
@end
//
// ShadowButton.m
#import "ShadowButton.h"
#import <QuartzCore/QuartzCore.h>
@implementation ShadowButton
-(void)setupView{
self.layer.shadowColor = [UIColor blackColor].CGColor;
self.layer.shadowOpacity = 0.5;
self.layer.shadowRadius = 1;
self.layer.shadowOffset = CGSizeMake(2.0f, 2.0f);
}
-(id)initWithFrame:(CGRect)frame{
if((self = [super initWithFrame:frame])){
[self setupView];
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder{
if((self = [super initWithCoder:aDecoder])){
[self setupView];
}
return self;
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
self.contentEdgeInsets = UIEdgeInsetsMake(1.0,1.0,-1.0,-1.0);
self.layer.shadowOffset = CGSizeMake(1.0f, 1.0f);
self.layer.shadowOpacity = 0.8;
[super touchesBegan:touches withEvent:event];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
self.contentEdgeInsets = UIEdgeInsetsMake(0.0,0.0,0.0,0.0);
self.layer.shadowOffset = CGSizeMake(2.0f, 2.0f);
self.layer.shadowOpacity = 0.5;
[super touchesEnded:touches withEvent:event];
}
@end
您可以在Xcode中创建子类并配置其值
以下是一个例子:
import UIKit
import QuartzCore
@IBDesignable
class CustomButton: UIButton {
@IBInspectable var cornerRadius: CGFloat = 0 {
didSet {
layer.cornerRadius = cornerRadius
}
}
@IBInspectable var borderWidth: CGFloat = 0 {
didSet {
layer.borderWidth = borderWidth
}
}
@IBInspectable var borderColor: UIColor = UIColor.gray {
didSet {
layer.borderColor = borderColor.cgColor
}
}
@IBInspectable var shadowColor: UIColor = UIColor.gray {
didSet {
layer.shadowColor = shadowColor.cgColor
}
}
@IBInspectable var shadowOpacity: Float = 1.0 {
didSet {
layer.shadowOpacity = shadowOpacity
}
}
@IBInspectable var shadowRadius: CGFloat = 1.0 {
didSet {
layer.shadowRadius = shadowRadius
}
}
@IBInspectable var masksToBounds: Bool = true {
didSet {
layer.masksToBounds = masksToBounds
}
}
@IBInspectable var shadowOffset: CGSize = CGSize(width: 12, height: 12) {
didSet {
layer.shadowOffset = shadowOffset
}
}
}
您可以子类化UIButton并覆盖drawRect:方法并手动添加投影。 这是更多的工作,你现在应该关于石英2d的一些事情,但结果正是你想要的。 否则你可以添加一个图像,但我更喜欢子类UIButton,因为它对于按钮的大小非常灵活,它更通用。
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