UIAlertController是iOS8出来的新方法，其将系统原先的UIAlertView和UIActionSheet进行了整合。UIAlertView和UIActionSheet被废弃也是迟早的事，为了避免以后大量修改代码，我们需要对其进行封装。

#import <Foundation/Foundation.h>
@interface AlertViewTool : NSObject
//封装拥有两个按钮的AlertView
- (void)showAlertView:(UIViewController *)viewController title:(NSString *)title message:(NSString *)message cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitle:(NSString *)otherButtonTitle confirm:(void (^)())confirm cancle:(void (^)())cancle;

//简单AlertView使用
+ (void) showSimpleAlertOnViewController:(UIViewController *)viewController WithTitle:(NSString*) title message:(NSString*) message;
@end

.m文件

#import "AlertViewTool.h"

typedef void (^confirm)();
typedef void (^cancle)();

@interface AlertViewTool ()<UIAlertViewDelegate>
@property (nonatomic, copy) confirm confirmAction;
@property (nonatomic, copy) cancle cancleAction;

@end

@implementation AlertViewTool
- (void)showAlertView:(UIViewController *)viewController title:(NSString *)title message:(NSString *)message cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitle:(NSString *)otherButtonTitle confirm:(void (^)())confirm cancle:(void (^)())cancle {
    self.confirmAction = nil;
    self.cancleAction = nil;
    self.confirmAction = confirm;
    self.cancleAction = cancle;
    if (IS_IOS8) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
        // Create the actions.
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            cancle();
        }];
        UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            confirm();
        }];
        // Add the actions.
        [alertController addAction:cancelAction];
        [alertController addAction:otherAction];
        [viewController presentViewController:alertController animated:YES completion:nil];
    } else{
        UIAlertView *TitleAlert = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitle,nil];
        [TitleAlert show];
    }

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex==0) {
        self.cancleAction();
    } else{
        self.confirmAction();
    }
}
//简单AlertView使用
+ (void) showSimpleAlertOnViewController:(UIViewController *)viewController WithTitle:(NSString*) title message:(NSString*) message {
    if (IS_IOS8) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
        // Create the actions.
        UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        }];
        
        // Add the actions.
        [alertController addAction:confirmAction];
        [viewController presentViewController:alertController animated:YES completion:nil];
    } else{
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"知道了" otherButtonTitles:nil, nil];
        [alertView show];
    }
    
    
}
@end