阅读此篇文章前建议阅读前篇Block的多种使用场景
在封装AlertController前，先复习一下AlertController的用法，showTime
UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"标题" message:@"提示语" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
}];
UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"默认风格" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}];
[alertC addAction:action1];
[alertC addAction:action2];
[self presentViewController:alertC animated:YES completion:nil];
虽然系统的调用方法也是很简洁，如果只使用一次的话，那没关系，但是如果多个地方要使用的时候，你就会发现代码量不少、步骤也重复，所以不方便
image.png
第一次尝试使用思维导图整理逻辑（比较丑，我们就将就点），如上图所示，我们以“分-总”的方式分析
要封装的控件：
AlertController和AlertAction
输入的内容：
有两种，一种是只有一次(A)，另一种是自由配置(B)。对于"A"的情况，考虑的就是在API处直接添加入参则可以，而对于B则使用建模的方式配置，如AlertActionModel（基本属性：title、style）
响应：
这也是相同的道理，在封装功能的时候对一些可配置和一些只调用一次额做分类，这样更能清楚在API处要暴露什么入参或回调。对此，“展示present”的跳转则不会暴露，而AlertAction的点击响应则需要公开出来
根据上面的分析，API总体的构成要素基本是定下来的，如下
image.png
而功能的调用方式，本人是考虑使用ViewController的分类，也符合MVC和MVVM主流设计模式中ViewController的功能职责，不会有冲突
开始撸代码...（代码都带有注释，就不解释了）
//UIViewController+LZAlertViewController.m文件
#import <UIKit/UIKit.h>
@class LZAlertController;
#pragma mark - I LZAlertController构造
/**
alertAction配置链
@param title 标题
@return LZAlertController对象
*/
typedef LZAlertController *_Nonnull (^LZAlertActionTitle)(NSString * _Nonnull title);
/**
alertz按钮执行回调
@param buttonIndex 按钮index
@param action UIAlertAction对象
@param alertSelf 本类对象
*/
typedef void (^LZAlertActionBlock)(NSInteger buttonIndex, UIAlertAction * _Nonnull action, LZAlertController * _Nonnull alertSelf);
@interface LZAlertController : UIAlertController
/* alert弹出后，可配置的回调 **/
@property (nullable, nonatomic, copy) void (^alertDidShown)(void);
/* alert关闭后, 可配置的回调 **/
@property (nullable, nonatomic, copy) void (^alertDidDismiss)(void);
/* 设置toast模式展示时间：如果alert未添加任何按钮，将会以toast样式展示，默认一秒 **/
@property(nonatomic,assign ) NSTimeInterval toastStyleDuration;
/**
禁用alert弹出动画，默认执行系统的默认弹出动画
*/
- (void)alertAnimateDisabled;
/**
链式构造alert视图按钮，添加一个alertAction按钮，默认样式，参数为标题
@return LZAlertController 对象
*/
- (LZAlertActionTitle _Nonnull )addActionDefaultTitle;
/**
链式构造alert视图按钮，添加一个alertAction按钮，取消样式，参数为标题
@return LZAlertController 对象
*/
- (LZAlertActionTitle _Nonnull )addActionCancleTitle;
/**
链式构造alert视图按钮，添加一个alertAction按钮，警告样式，参数为标题
@return LZAlertController 对象
*/
- (LZAlertActionTitle _Nonnull )addActionDestructiveTitle;
@end
#pragma mark - II 类别
/* alert构造块 **/
typedef void (^LZAlertAppearanceProcess)(LZAlertController * _Nonnull alertMaker);
@interface UIViewController (LZAlertViewController)
/**
show-alert(iOS_8.0)
@param title title
@param message message
@param appearanceProcesss alert配置过程
@param actionBlock alert点击响应回调
*/
- (void)lz_showAlertWithTitle:(nullable NSString *)title
message:(nullable NSString *)message
appearanceProcess:(LZAlertAppearanceProcess _Nonnull )appearanceProcesss
actionsBlock:(nullable LZAlertActionBlock)actionBlock;
/**
show-actionSheet(iOS_8.0)
@param title title
@param message message
@param appearanceProcess actionSheet配置过程
@param actionBlock actionSheet点击响应回调
*/
- (void)lz_showActionSheetWithTitle:(nullable NSString *)title
message:(nullable NSString *)message
appearanceProcess:(LZAlertAppearanceProcess _Nonnull )appearanceProcess
actionsBlock:(nullable LZAlertActionBlock)actionBlock;
@end
//UIViewController+LZAlertViewController.m文件
#import "UIViewController+LZAlertViewController.h"
/* 默认展示时间 **/
static NSTimeInterval const LZAlertShowDurationDefault = 1.0f;
#pragma mark - I AlertActionModel
@interface LZAlertActionModel : NSObject
@property(nonatomic,copy ) NSString *title;
@property(nonatomic,assign ) UIAlertActionStyle style;
@end
@implementation LZAlertActionModel
- (instancetype)init {
if (self = [super init]) {
self.title = @"";
self.style = UIAlertViewStyleDefault;
}
return self;
}
@end
#pragma mark - II LZAlertController
/* alertActions 配置 **/
typedef void (^LZAlertAcitionsConfig)(LZAlertActionBlock actionBlock);
@interface LZAlertController()
/* alertActionModel数组 **/
@property(nonatomic,strong) NSMutableArray <LZAlertActionModel *> *alertActionArray;
/* 是否执行动画 **/
@property(nonatomic,assign) BOOL setAlertAnimated;
/**
action配置
*/
- (LZAlertAcitionsConfig)alertActionsConfig;
@end
@implementation LZAlertController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
if (self.alertDidDismiss) {
self.alertDidDismiss();
}
}
#pragma mark - private
- (NSMutableArray<LZAlertActionModel *> *)alertActionArray {
if (_alertActionArray == nil) {
_alertActionArray = [NSMutableArray array];
}
return _alertActionArray;
}
- (LZAlertAcitionsConfig)alertActionsConfig {
return ^(LZAlertActionBlock actionBlock){
if (self.alertActionArray.count>0) {
//创建alertAction
__weak typeof(self)weakSelf = self;
[self.alertActionArray enumerateObjectsUsingBlock:^(LZAlertActionModel * actionModel, NSUInteger idx, BOOL * _Nonnull stop) {
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:actionModel.title style:actionModel.style handler:^(UIAlertAction * _Nonnull action) {
__strong typeof(weakSelf)strongSelf = weakSelf;
if (actionBlock) {
actionBlock(idx,action,strongSelf);
}
}];
[self addAction:alertAction];
}];
}
else
{
NSTimeInterval duration = self.toastStyleDuration > 0 ? self.toastStyleDuration : LZAlertShowDurationDefault;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(duration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self dismissViewControllerAnimated:!(self.setAlertAnimated) completion:NULL];
});
}
};
}
#pragma mark - Public
- (instancetype)initAlertControllerWithTitle:(NSString *)title message:(NSString *)message preferredStyle:(UIAlertControllerStyle)preferredStyle {
if (!(title.length>0) && (message.length>0) && preferredStyle == UIAlertControllerStyleAlert) {
title = @"";
}
self = [[self class] alertControllerWithTitle:title message:message preferredStyle:preferredStyle];
if (!self) return nil;
self.setAlertAnimated = NO;
return self;
}
- (void)alertAnimateDisabled {
self.setAlertAnimated = YES;
}
- (LZAlertActionTitle)addActionDefaultTitle {
return ^(NSString *title){
LZAlertActionModel *actionModel = [[LZAlertActionModel alloc]init];
actionModel.title = title;
actionModel.style = UIAlertActionStyleDefault;
[self.alertActionArray addObject:actionModel];
return self;
};
}
- (LZAlertActionTitle)addActionCancleTitle {
return ^(NSString *title){
LZAlertActionModel *actionModel = [[LZAlertActionModel alloc]init];
actionModel.title = title;
actionModel.style = UIAlertActionStyleCancel;
[self.alertActionArray addObject:actionModel];
return self;
};
}
- (LZAlertActionTitle)addActionDestructiveTitle {
return ^(NSString *title){
LZAlertActionModel *actionModel = [[LZAlertActionModel alloc]init];
actionModel.title = title;
actionModel.style = UIAlertActionStyleDestructive;
[self.alertActionArray addObject:actionModel];
return self;
};
}
@end
#pragma mark - III 类别
@implementation UIViewController (LZAlertViewController)
- (void)lz_showAlertWithPreferredStyle:(UIAlertControllerStyle)preferredStyle title:(NSString *)title message:(NSString *)message appearanceProcess:(LZAlertAppearanceProcess)appearanceProcess actionsBlock:(LZAlertActionBlock)actionBlock {
if (appearanceProcess) {
LZAlertController *alertMaker = [[LZAlertController alloc]initAlertControllerWithTitle:title message:message preferredStyle:preferredStyle];
//防止nil
if (alertMaker == nil) {
return;
}
//加工链：添加alertAction
appearanceProcess(alertMaker);
//配置响应
alertMaker.alertActionsConfig(actionBlock);
if (alertMaker.alertDidShown) {
[self presentViewController:alertMaker animated:!alertMaker.setAlertAnimated completion:^{
alertMaker.alertDidShown();
}];
}
else{
[self presentViewController:alertMaker animated:!alertMaker.setAlertAnimated completion:NULL];
}
}
}
- (void)lz_showAlertWithTitle:(NSString *)title message:(NSString *)message appearanceProcess:(LZAlertAppearanceProcess)appearanceProcesss actionsBlock:(LZAlertActionBlock)actionBlock {
[self lz_showAlertWithPreferredStyle:UIAlertControllerStyleAlert title:title message:message appearanceProcess:appearanceProcesss actionsBlock:actionBlock];
}
- (void)lz_showActionSheetWithTitle:(NSString *)title message:(NSString *)message appearanceProcess:(LZAlertAppearanceProcess)appearanceProcess actionsBlock:(LZAlertActionBlock)actionBlock {
[self lz_showAlertWithPreferredStyle:UIAlertControllerStyleActionSheet title:title message:message appearanceProcess:appearanceProcess actionsBlock:actionBlock];
}
@end
//调用
[self lz_showAlertWithTitle:@"AlertViewTest" message:@"" appearanceProcess:^(LZAlertController * _Nonnull alertMaker) {
alertMaker.addActionDefaultTitle(@"默认样式");
alertMaker.addActionDestructiveTitle(@"警告样式");
alertMaker.addActionCancleTitle(@"取消样式");
} actionsBlock:^(NSInteger buttonIndex, UIAlertAction * _Nonnull action, LZAlertController * _Nonnull alertSelf) {
NSLog(@"点击了第%ld个",buttonIndex);
}];
[self lz_showActionSheetWithTitle:@"SheetViewTest" message:@"" appearanceProcess:^(LZAlertController * _Nonnull alertMaker) {
alertMaker.addActionDefaultTitle(@"默认样式");
alertMaker.addActionDestructiveTitle(@"警告样式");
alertMaker.addActionCancleTitle(@"取消样式");
} actionsBlock:^(NSInteger buttonIndex, UIAlertAction * _Nonnull action, LZAlertController * _Nonnull alertSelf) {
switch (action.style) {
case UIAlertActionStyleDefault:
NSLog(@"默认");
break;
case UIAlertActionStyleCancel:
NSLog(@"取消");
break;
case UIAlertActionStyleDestructive:
NSLog(@"警告");
break;
default:
break;
}
}];
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