IBActionSheet - ios

源码地址IBActionSheet

最初接触到IBActionSheet是因为用UIActionSheet的时候，项目组有人说会导致内存泄露，在delegate那里，查了一下文档

文档介绍

weak 声明，肯定不会引起内存泄露啦。ios8以后已经不赞成使用UIActionSheet了，话说回来，IBActionSheet 是可以自己定制的UIActionSheet，类似ios7风格，而且按钮类型可以自己定制！ 系统的添加标题方式如下：

- (NSInteger)addButtonWithTitle:(NSString *)title;


(NSString *)buttonTitleAtIndex:(NSInteger)buttonIndex;
 

IBActionSheet的就丰富多了

- (NSInteger)addButtonWithTitle:(NSString *)title;


(void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated;
(id)initWithTitle:(NSString *)title delegate:(id)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)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;
 

还有其他添加的方式，主要是支持block,大爱呀！

源码分析：点击黑色半透明区域消失：

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(cancelSelection)];
 tap.numberOfTapsRequired = 1;
 [self.transparentView addGestureRecognizer:tap];

先判断回调函数有木有处理，然后删除，因为删除有动画过程所以单独处理了一下

- (void) cancelSelection {
 if(self.callback) self.callback(self, NSIntegerMax);
 [self removeFromView];
 }
 

removeFromView

处理消失的过程！
这里因为兼容了ios7以前的版本！所以使用

#define SYSTEM_VERSION_LESS_THAN(version) ([[[UIDevice currentDevice] systemVersion] compare:version options:NSNumericSearch] == NSOrderedAscending)
 

判断了一下。为了使用ios7才有的动画函数：

+ (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);
 

增加了阻尼系数，弹性系数，让动画看起来更加真实，逼真！
还有一点比较有趣的函数：

- (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;
}

通常的方法设置圆角，会导致四个边角都会有圆角，如果只要设置一个方向的圆角，可以考虑这种方法。好饿，今天源码读到这里暂时！