源碼地址IBActionSheet

最初接觸到IBActionSheet是因為用UIActionSheet的時候，項目組有人說會導(dǎo)致內(nèi)存泄露，在delegate那里，查了一下文檔

文檔介紹

weak 聲明，肯定不會引起內(nèi)存泄露啦。ios8以后已經(jīng)不贊成使用UIActionSheet了，話說回來，IBActionSheet 是可以自己定制的UIActionSheet，類似ios7風(fēng)格，而且按鈕類型可以自己定制！ 系統(tǒng)的添加標題方式如下：
<pre><code>- (NSInteger)addButtonWithTitle:(NSString *)title;

• (NSString *)buttonTitleAtIndex:(NSInteger)buttonIndex;
  </code></pre>

IBActionSheet的就豐富多了
<pre><code>- (NSInteger)addButtonWithTitle:(NSString *)title;

• (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated;
• (id)initWithTitle:(NSString *)title delegate:(id<IBActionSheetDelegate>)delegate cancelButtonTitle:(NSString *)cancelTitle destructiveButtonTitle:(NSString *)destructiveTitle otherButtonTitles:(NSString *)otherTitles, ... NS_REQUIRES_NIL_TERMINATION;
• (id)initWithTitle:(NSString *)title callback:(IBActionCallback)callback cancelButtonTitle:(NSString *)cancelTitle destructiveButtonTitle:(NSString *)destructiveTitle otherButtonTitles:(NSString *)otherTitles, ... NS_REQUIRES_NIL_TERMINATION;
• (id)initWithTitle:(NSString *)title delegate:(id<IBActionSheetDelegate>)delegate cancelButtonTitle:(NSString *)cancelTitle destructiveButtonTitle:(NSString *)destructiveTitle otherButtonTitlesArray:(NSArray *)otherTitlesArray;
• (id)initWithTitle:(NSString *)title callback:(IBActionCallback)callback cancelButtonTitle:(NSString *)cancelTitle destructiveButtonTitle:(NSString *)destructiveTitle otherButtonTitlesArray:(NSArray *)otherTitlesArray;
• (NSInteger)numberOfButtons;
• (NSString *)buttonTitleAtIndex:(NSInteger)index;
• (void)rotateToCurrentOrientation;
  // fonts
• (void)setFont:(UIFont *)font;
• (void)setTitleFont:(UIFont *)font;
• (void)setFont:(UIFont *)font forButtonAtIndex:(NSInteger)index;
  </code></pre>
  還有其他添加的方式，主要是支持block,大愛呀！

源碼分析：點擊黑色半透明區(qū)域消失：
<pre><code>UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(cancelSelection)];
tap.numberOfTapsRequired = 1;
[self.transparentView addGestureRecognizer:tap];</code></pre>
先判斷回調(diào)函數(shù)有木有處理，然后刪除，因為刪除有動畫過程所以單獨處理了一下
<pre><code>- (void) cancelSelection {
if(self.callback) self.callback(self, NSIntegerMax);
[self removeFromView];
}
</code></pre>

<pre><code>removeFromView</code></pre>處理消失的過程！
這里因為兼容了ios7以前的版本！所以使用<pre><code>#define SYSTEM_VERSION_LESS_THAN(version) ([[[UIDevice currentDevice] systemVersion] compare:version options:NSNumericSearch] == NSOrderedAscending)
</code></pre>判斷了一下。為了使用ios7才有的動畫函數(shù)：<pre><code>+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatio initialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion NS_AVAILABLE_IOS(7_0);
</code></pre>增加了阻尼系數(shù)，彈性系數(shù)，讓動畫看起來更加真實，逼真！
還有一點比較有趣的函數(shù)：

- (void)setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners
{
    UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:view.bounds
                                                  byRoundingCorners:corners
                                                        cornerRadii:CGSizeMake(4.0, 4.0)];
    CAShapeLayer *shape = [[CAShapeLayer alloc] init];
    [shape setPath:rounded.CGPath];
    view.layer.mask = shape;
}

通常的方法設(shè)置圓角，會導(dǎo)致四個邊角都會有圓角，如果只要設(shè)置一個方向的圓角，可以考慮這種方法。好餓，今天源碼讀到這里暫時！