前言
我们都知道UIAlertView UIActionSheet 是iOS 8.0之前的方法，在iOS 8.0之后，苹果公司开始放弃这些方法，采用UIAlertController来制作提醒提示框。
所以此次的目的主要是将UIAlertView UIActionSheet UIAlertController统一封装，根据用户手机系统版本自动采用UIAlertView UIActionSheet还是 UIAlertController。
这样可以保证你的代码可以跨系统使用。
具体效果如下：
未命名.gif
知识点一：NS_REQUIRES_NIL_TERMINATION
NS_REQUIRES_NIL_TERMINATION是一个宏，告知编译器 需要一个结尾的参数,告知编译器参数的列表已经到最后一个不要再继续执行下去了。
该方法总传递的Action Item 和 数组之间的转换为：
// 读取可变参数里面的titles数组
NSMutableArray *titleArray = [[NSMutableArray alloc] initWithCapacity:0];
va_list list;
if(buttonTitles) {
//1.取得第一个参数的值(即是buttonTitles)
[titleArray addObject:buttonTitles];
//2.从第2个参数开始，依此取得所有参数的值
NSString *otherTitle;
va_start(list, buttonTitles);
while ((otherTitle= va_arg(list, NSString*))) {
[titleArray addObject:otherTitle];
}
va_end(list);
}
知识点二：UIAlertControllerStyleActionSheet与UIActionSheet区别
UIAlertControllerStyleActionSheet支持message；
而UIActionSheet是没有message 只有title；
具体大家可以查看各自的初始化方法就知道了。
这里直接上代码
.h文件
//
// LeeAlertSheetView.h
// FrameWork
//
// Created by LeeMiao on 2017/8/9.
// Copyright © 2017年 Limiao. All rights reserved.
//
#import <Foundation/Foundation.h>
typedef void(^myAlertSheetViewBlock)(NSInteger buttonTag,NSString *buttonTitle);
static NSInteger const cancelIndex = -1;
@interface LeeAlertSheetView : NSObject
/**
单例模式
@return 单例对象
*/
+(LeeAlertSheetView *)sharedInstacne;
/**
* 创建提示框(Alert 可变参数版)
*
* @param title 标题
* @param message 提示内容
* @param cancelTitle 取消按钮(无操作,为nil则只显示一个按钮)
* @param vc VC iOS8及其以后会用到
* @param confirm 点击按钮的回调(取消按钮的Index是cancelIndex -1)
* @param buttonTitles 按钮(为nil,默认为"确定",传参数时必须以nil结尾，否则会崩溃)
*/
- (void)showAlert:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc confirm:(myAlertSheetViewBlock)confirm buttonTitles:(NSString *)buttonTitles, ... NS_REQUIRES_NIL_TERMINATION;
/**
* 创建菜单(Sheet 可变参数版)
*
* @param title 标题
* @param message 提示内容
* @param cancelTitle 取消按钮(无操作,为nil则只显示一个按钮)
* @param vc VC
* @param confirm 点击按钮的回调(取消按钮的Index是cancelIndex -1)
* @param buttonTitles 按钮(为nil,默认为"确定",传参数时必须以nil结尾，否则会崩溃)
*/
- (void)showSheet:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc confirm:(myAlertSheetViewBlock)confirm buttonTitles:(NSString *)buttonTitles, ... NS_REQUIRES_NIL_TERMINATION ;
@end
.m文件
//
// LeeAlertSheetView.m
// FrameWork
//
// Created by LeeMiao on 2017/8/9.
// Copyright © 2017年 Limiao. All rights reserved.
//
#import "LeeAlertSheetView.h"
#define RootVC [[UIApplication sharedApplication] keyWindow].rootViewController
#define IOS8AndLater [[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0
@interface LeeAlertSheetView () <UIActionSheetDelegate,UIAlertViewDelegate>
@property (nonatomic, copy) myAlertSheetViewBlock block;
@property (nonatomic,assign) NSInteger selectBtnTag;
@end
@implementation LeeAlertSheetView
#pragma mark- 对外方法
+(LeeAlertSheetView *)sharedInstacne{
static LeeAlertSheetView *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc] init];
});
return instance;
}
-(void)showAlert:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc confirm:(myAlertSheetViewBlock)confirm buttonTitles:(NSString *)buttonTitles, ...{
if (!vc) vc = RootVC;
// 读取可变参数里面的titles数组
NSMutableArray *titleArray = [[NSMutableArray alloc] initWithCapacity:0];
va_list list;
if(buttonTitles) {
//1.取得第一个参数的值(即是buttonTitles)
[titleArray addObject:buttonTitles];
//2.从第2个参数开始，依此取得所有参数的值
NSString *otherTitle;
va_start(list, buttonTitles);
while ((otherTitle= va_arg(list, NSString*))) {
[titleArray addObject:otherTitle];
}
va_end(list);
}
if (IOS8AndLater) {
[self lee_showAlertController:title message:message cancelTitle:cancelTitle titleArray:titleArray viewController:vc confirm:confirm];
}else{
[self lee_showAlertView:title message:message cancelTitle:cancelTitle viewController:vc confirm:confirm titleArray:titleArray];
}
}
-(void)showSheet:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc confirm:(myAlertSheetViewBlock)confirm buttonTitles:(NSString *)buttonTitles, ...{
if (!vc) vc = RootVC;
// 读取可变参数里面的titles数组
NSMutableArray *titleArray = [[NSMutableArray alloc] initWithCapacity:0];
va_list list;
if(buttonTitles) {
//1.取得第一个参数的值(即是buttonTitles)
[titleArray addObject:buttonTitles];
//2.从第2个参数开始，依此取得所有参数的值
NSString *otherTitle;
va_start(list, buttonTitles);
while ((otherTitle= va_arg(list, NSString*))) {
[titleArray addObject:otherTitle];
}
va_end(list);
}
if (IOS8AndLater) {
[self lee_showSheetAlertController:title message:message cancelTitle:cancelTitle titleArray:titleArray viewController:vc confirm:confirm];
}else{
[self lee_showSheetView:title message:message cancelTitle:cancelTitle viewController:vc confirm:confirm titleArray:titleArray];
}
}
#pragma mark - ----------------内部方法 IOS8 以后------------------
//UIAlertController(iOS8及其以后)
- (void)lee_showAlertController:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle titleArray:(NSArray *)titleArray viewController:(UIViewController *)vc
confirm:(myAlertSheetViewBlock)confirm {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
// 下面两行代码 是修改 title颜色和字体的代码
// NSAttributedString *attributedMessage = [[NSAttributedString alloc] initWithString:title attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:17.0f], NSForegroundColorAttributeName:UIColorFrom16RGB(0x334455)}];
// [alert setValue:attributedMessage forKey:@"attributedTitle"];
if (cancelTitle) {
// 取消
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
if (confirm) {
confirm(0, action.title);
}
}];
[alert addAction:cancelAction];
}
// 确定操作
if (!titleArray || titleArray.count == 0) {
UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (confirm)confirm(0,action.title);
}];
[alert addAction:confirmAction];
} else {
for (NSInteger i = 0; i<titleArray.count; i++) {
UIAlertAction *action = [UIAlertAction actionWithTitle:titleArray[i] style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (confirm)confirm(i,action.title);
}];
// [action setValue:UIColorFrom16RGB(0x00AE08) forKey:@"titleTextColor"]; // 此代码 可以修改按钮颜色
[alert addAction:action];
}
}
[vc presentViewController:alert animated:YES completion:nil];
}
// ActionSheet的封装(iOS8及其以后)
- (void)lee_showSheetAlertController:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle titleArray:(NSArray *)titleArray viewController:(UIViewController *)vc confirm:(myAlertSheetViewBlock)confirm {
UIAlertController *sheet = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];
if (!cancelTitle) cancelTitle = @"取消";
// 取消
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
if (confirm)confirm(cancelIndex,action.title);
}];
[sheet addAction:cancelAction];
if (titleArray.count > 0) {
for (NSInteger i = 0; i<titleArray.count; i++) {
UIAlertAction *action = [UIAlertAction actionWithTitle:titleArray[i] style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
if (confirm)confirm(i,action.title);
}];
[sheet addAction:action];
}
}
[vc presentViewController:sheet animated:YES completion:nil];
}
#pragma mark - ----------------内部方法 IOS8 之前------------------
//UIAlertView
-(void)lee_showAlertView:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc
confirm:(myAlertSheetViewBlock)confirm titleArray:(NSArray *)titleArray{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:title message:message delegate:self cancelButtonTitle:cancelTitle otherButtonTitles: nil];
if (confirm){
self.block = confirm;
}
[titleArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[alert addButtonWithTitle:obj];
}];
[alert show];
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (self.block) {
self.block(buttonIndex,[alertView buttonTitleAtIndex:buttonIndex]);
}
}
//UIActionSheet
-(void)lee_showSheetView:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle viewController:(UIViewController *)vc
confirm:(myAlertSheetViewBlock)confirm titleArray:(NSArray *)titleArray{
UIActionSheet *sheet = [[UIActionSheet alloc]initWithTitle:title delegate:self cancelButtonTitle:cancelTitle destructiveButtonTitle:nil otherButtonTitles:nil];
if (confirm){
self.block = confirm;
}
[titleArray enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
[sheet addButtonWithTitle:obj];
}];
[sheet showInView:vc.view];
}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
if (self.block) {
self.block(buttonIndex,[actionSheet buttonTitleAtIndex:buttonIndex]);
}
}
@end
使用方法
[[LeeAlertSheetView sharedInstacne]showSheet:nil message:nil cancelTitle:@"取消" viewController:self confirm:^(NSInteger buttonTag,NSString *buttonTitle) {
NSLog(@"%ld-%@",buttonTag,buttonTitle);
// 你的业务逻辑根据buttonTag，buttonTitle 处理。
} buttonTitles:@"Hello",@"Lee",@"Miao", nil];
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