PSTAlertController 是为了能让用户从 iOS7开始兼容 UIAlertController
why UIAlertController?
iOS8 以后出的新类，目标就是为了替代 UIActionSheet
and UIAlertView
,接口也极其友好，容易创建，以controller的形式展示更方便点！
兼容iOS7 的痛苦，不能使用心得API 还好git上有这么多优秀的开源项目！
话说，为什么我们现在还要兼容iOS7呢？？
PSTAlertController 其实也没有什么特别的地方通过判断能不能使用 UIAlertController 来创建的
- (BOOL)alertControllerAvailable {
return [UIAlertController class] != nil; // iOS 8 and later.
}
以上就是判断创建的时候生成view的时候生成哪个
- (instancetype)initWithTitle:(NSString *)title message:(NSString *)message preferredStyle:(PSTAlertControllerStyle)preferredStyle {
if ((self = [super init])) {
_title = [title copy];
_message = [message copy];
_preferredStyle = preferredStyle;
if ([self alertControllerAvailable]) {
_alertController = [PSTExtendedAlertController alertControllerWithTitle:title message:message preferredStyle:(UIAlertControllerStyle)preferredStyle];
} else {
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 80000
if (preferredStyle == PSTAlertControllerStyleActionSheet) {
_strongSheetStorage = [[UIActionSheet alloc] initWithTitle:title delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
} else {
_strongSheetStorage = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
}
#endif
}
}
return self;
}
创建的时候再根据能不能使用UIAlertController和类型来创建
UIAlertController 或者 UIActionSheet 或者 UIAlertView
- (UIAlertView *)alertView {
return (UIAlertView *)(self.strongSheetStorage ?: self.weakSheetStorage);
}
- (UIActionSheet *)actionSheet {
return (UIActionSheet *)(self.strongSheetStorage ?: self.weakSheetStorage);
}
获取alertView 或者 actionView
- (void)addAction:(PSTAlertAction *)action {
NSAssert([action isKindOfClass:PSTAlertAction.class], @"Must be of type PSTAlertAction");
action.alertController = self; // weakly connect
self.actions = [[NSArray arrayWithArray:self.actions] arrayByAddingObject:action];
if ([self alertControllerAvailable]) {
__weak typeof (self) weakSelf = self;
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:action.title style:(UIAlertActionStyle)action.style handler:^(UIAlertAction *uiAction) {
weakSelf.executedAlertAction = action;
[action performAction];
}];
[self.alertController addAction:alertAction];
} else {
if (self.preferredStyle == PSTAlertControllerStyleActionSheet) {
NSUInteger currentButtonIndex = [self.actionSheet addButtonWithTitle:action.title];
if (action.style == PSTAlertActionStyleDestructive) {
self.actionSheet.destructiveButtonIndex = currentButtonIndex;
} else if (action.style == PSTAlertActionStyleCancel) {
self.actionSheet.cancelButtonIndex = currentButtonIndex;
}
} else {
NSUInteger currentButtonIndex = [self.alertView addButtonWithTitle:action.title];
// UIAlertView doesn't support destructive buttons.
if (action.style == PSTAlertActionStyleCancel) {
self.alertView.cancelButtonIndex = currentButtonIndex;
}
}
}
}
添加点击行为，也是根据 alertControllerAvailable 先判断是不是iOS8 以前的系统.如果不是，就调用 UIAlertView 或者 UIActionSheet的添加按钮的方式添加。
- (NSInteger)addButtonWithTitle:(nullable NSString *)title; // returns index of button. 0 based.
需要执行的block则保存在actions 数组中。如果是iOS8之前的系统，则会在UIAlertView或者UIActionSheet的代理中执行，比如：
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
[self viewWillDismissWithButtonIndex:buttonIndex];
}
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
[self viewDidDismissWithButtonIndex:buttonIndex];
}
JCAlertController 一览
更加丰富的从iOS7开始支持的弹窗还有JCAlertController 详情见git地址。支持的样式更多，而且支持以一个队列的方式弹出。比如：
请看下面的伪代码:
[self presentWithFIFO:alert1];
[self presentWithFIFO:alert2];
[self presentWithFIFO:alert3];
结果:
alert1第一个显示, 被用户关闭后, alert2第二个显示, 被用户关闭后, alert3第三个显示
就像这样: alert1 >> alert2 >> alert3
JCAlertController的源码文件如下
|____.DS_Store
|____AlertView
| |____JCAlertView.h
| |____JCAlertView.m
|____ButtonItem
| |____JCAlertButtonItem.h
| |____JCAlertButtonItem.m
|____Category
| |____NSAttributedString+JCCalculateSize.h
| |____NSAttributedString+JCCalculateSize.m
| |____UIColor+JCHightlightedColor.h
| |____UIColor+JCHightlightedColor.m
| |____UIImage+JCColor2Image.h
| |____UIImage+JCColor2Image.m
| |____UIViewController+JCPresentQueue.h // present category
| |____UIViewController+JCPresentQueue.m
| |____UIWindow+JCBlur.h
| |____UIWindow+JCBlur.m
|____JCAlertController.h // import this
|____JCAlertController.m
|____Style
| |____JCAlertStyle.h
| |____JCAlertStyle.m
| |____JCAlertStyleAlertView.h
| |____JCAlertStyleAlertView.m
| |____JCAlertStyleBackground.h
| |____JCAlertStyleBackground.m
| |____JCAlertStyleButton.h
| |____JCAlertStyleButton.m
| |____JCAlertStyleButtonCancel.h
| |____JCAlertStyleButtonCancel.m
| |____JCAlertStyleButtonNormal.h
| |____JCAlertStyleButtonNormal.m
| |____JCAlertStyleButtonWarning.h
| |____JCAlertStyleButtonWarning.m
| |____JCAlertStyleContent.h
| |____JCAlertStyleContent.m
| |____JCAlertStyleSeparator.h
| |____JCAlertStyleSeparator.m
| |____JCAlertStyleTitle.h
| |____JCAlertStyleTitle.m
平时使用的时候，只要import JCAlertController即可！
JCAlertController 中定义了一些初始化和添加元素的方法。
同时定义了一个分类，是当有键盘事件的时候怎么处理。
@interface JCAlertController (keyboardHandle)
看看 JCAlertController的组成
@interface JCAlertController ()
@property (nonatomic, strong) UIImageView *blurView;
@property (nonatomic, strong) UIButton *coverView;
@property (nonatomic, strong) JCAlertView *alertView;
@end
一个有模糊样式的背景图片。一个可以接收点击的时间的遮挡按钮，然后就是看到的提示框 JCAlertView
然后定义了 转场动画。
///消失的动画
@interface JCDimissAnimation : NSObject
@end
///弹出的动画
@interface JCPresentAnimation : NSObject
@end
用来展示提示框变化的过渡动画！
- (void)viewDidLoad {
[super viewDidLoad];
///设置背景模糊图片
[self setupBlurView];
///添加点击按钮
[self setupAlphaCoverView];
///根据整体Style设置alertView
[self setupAlertView];
}
唯一不能满足的就是没有ActionSheet的样式