UIAlertController简单封装使用

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注：本文转自 “iOS开发笔记(3) -- UIAlertController的二次封装” 如要查看原文，请点击进入。

时间有脚

在我们的项目中，在需要使用到 UIAlertController 时候，不可能每次都去重新把初始化之类的东西重新写一次，还不如自己进行二次封装成工具类，直接调用工具类，这样代码的结构就更加合理。

• AlertToolViewController.h

#import 

@interface AlertToolViewController : UIAlertController

+ (instancetype)initWBAlerControllerWithTitle:(NSString *)title message:(NSString *)message style:(NSString *)style titleArr:(NSMutableArray *)titleArr alerAction:(void (^)(NSInteger index))alerAction;

-(void)showWBAler;
@end

• AlertToolViewController.m

#import "AlertToolViewController.h"

@interface AlertToolViewController ()

@end

@implementation AlertToolViewController

//重写方法
+ (instancetype)initWBAlerControllerWithTitle:(NSString *)title message:(NSString *)message style:(NSString *)style titleArr:(NSMutableArray *)titleArr alerAction:(void (^)(NSInteger index))alerAction{
    //参数说明:
    //title表示弹框的标题;
    //message表示弹框的展示的信息;
    //style是0或者1;代表弹框的类型;UIAlertControllerStyleActionSheet = 0,UIAlertControllerStyleAlert = 1;
    //titleArr为弹框中出现的按钮标题的数组;个数你自己决定;
    //alerAction为block回调事件,因为这里只需要判断点击的按钮坐标就可以,其他需要壳自行添加参数;
    
    //判断弹框类型
    if ([style isEqualToString:@"1"]) {
        AlertToolViewController *alert = [AlertToolViewController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
        for (NSInteger i = 0; i < titleArr.count; i++) {
            UIAlertAction *confirm = [UIAlertAction actionWithTitle:[titleArr objectAtIndex:i] style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
                if (alerAction) {
                    alerAction(i);
                }
                
            }];
            [alert addAction:confirm];
        }
        return alert;
        
    }else{
        AlertToolViewController *alert = [AlertToolViewController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleActionSheet];
        for (NSInteger i = 0; i < titleArr.count; i++) {
            UIAlertAction *confirm = [UIAlertAction actionWithTitle:[titleArr objectAtIndex:i] style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                
                if (alerAction) {
                    alerAction(i);
                }
                
            }];
            [alert addAction:confirm];
        }
        
        return alert;
    }
    
}

-(void)showWBAler{
    [[self getCurrentVC] presentViewController:self animated:YES completion:nil];
}


/**
 得到当前控制视图

 @return 当前控制视图
 */
-(UIViewController *)getCurrentVC
{
    UIViewController *result = nil;
    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal)
    {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for(UIWindow * tempWindow in windows)
        {
            if (tempWindow.windowLevel == UIWindowLevelNormal)
            {
                window = tempWindow;
                break;
            }
        }
    }
    UIView *frontView = [[window subviews] objectAtIndex:0];
    id nextResponder = [frontView nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]])
        result = nextResponder;
    else
        result = window.rootViewController;
    return result;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

• 调用

- (void)action{
    //参数说明:
    //style是0或者1;代表弹框的类型;UIAlertControllerStyleActionSheet = 0,UIAlertControllerStyleAlert = 1;
    //titleArr为弹框中出现的按钮标题的数组;个数你自己决定;
    //alerAction为block回调事件,因为这里只需要判断点击的按钮坐标就可以,其他需要壳自行添加参数;
    NSMutableArray *arr = [NSMutableArray arrayWithObjects:@"确定",@"取消", nil];
    AlertToolViewController *alert =[AlertToolViewController initWBAlerControllerWithTitle:@"Title" message:@"测试啊测试啊" style:@"1" titleArr:arr  alerAction:^(NSInteger index) {
        
        //这里为点击事件的回调;
        if (index == 0) {
            NSLog(@"1");
        }
        if (index == 1) {
            NSLog(@"2");
        }
        if (index == 2) {
            NSLog(@"3");
        }
    }];
    
    [alert showWBAler];
}