一 UIAlertView和UIAlertController的简介

1 UIAlertView简介
1.1 UIAlertView 主要接口简介

/**
 UIAlertView的默认初始化方法

 @param title 标题
 @param message 提示语
 @param delegate 代理
 @param cancelButtonTitle 取消按钮的文字
 @param otherButtonTitles 其他按钮的文字
 @return UIAlertView 实例
 */
- (instancetype)initWithTitle:(nullable NSString *)title message:(nullable NSString *)message delegate:(nullable id /**/)delegate cancelButtonTitle:(nullable NSString *)cancelButtonTitle otherButtonTitles:(nullable NSString *)otherButtonTitles, ... ;
// Alert view style - defaults to UIAlertViewStyleDefault
@property(nonatomic,assign) UIAlertViewStyle alertViewStyle

1.2 UIAlertViewDelegate接口:

// Called when a button is clicked. The view will be automatically dismissed after this call returns
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex NS_DEPRECATED_IOS(2_0, 9_0);

1.3 用法示例:

//显示alert
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"选取头像" message:@"" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"从相册中选取",@"照相", nil];
[alert show];
//监听点击按钮的代理方法
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    switch (buttonIndex) {
        case 0:
            NSLog(@"点击了取消");
            break;
        case 1:
            NSLog(@"点击了从相册中选取");
            break;
        case 2:
            NSLog(@"点击了照相");
            break;
        default:
            break;
    }
}

注意: buttonIndex为0 一定对应"取消"按钮, buttonIndex然后按照otherButtonTitles的顺序从1开始依次+1;

2 UIAlertController简介
2.1 UIAlertController主要接口介绍

/**
 默认初始化方法

 @param title 标题
 @param message 提示信息
 @param preferredStyle 弹出方式
 @return UIAlertController实例
 */
+ (instancetype)alertControllerWithTitle:(nullable NSString *)title message:(nullable NSString *)message preferredStyle:(UIAlertControllerStyle)preferredStyle;
/*
   向alert添加按钮和事件
*/
- (void)addAction:(UIAlertAction *)action;

2.2 UIAlertAction接口介绍

/**
 UIAlertAction默认初始化方法
 
 @param title 按钮显示文字
 @param style 按钮的类型
 @param handler 点击按钮触发的事件Block
 @return UIAlertAction实例
 */
+ (instancetype)actionWithTitle:(nullable NSString *)title style:(UIAlertActionStyle)style handler:(void (^ __nullable)(UIAlertAction *action))handler;

2.3 用法示例

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"标题" message:@"提示信息" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    NSLog(@"点击了确定后干什么写在这里");
}];

UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    NSLog(@"点击了取消后干什么写在这里,会默认关闭alert");
}];

[alert addAction:action1];
[alert addAction:action2];
[self presentViewController:alert animated:YES completion:nil];

二代码实现:

接下来是本文的重点,简单说明就是用UIAlertController的方式使用UIAlertView.
3.1 依赖类:LQAlertAction----功能类似UIAlertAction代码如下:

LQAlertAction.h
#import

typedef NS_ENUM(NSInteger, LQAlertActionStyle) {
    LQAlertActionStyleDefault = 0,
    LQAlertActionStyleCancel,
    LQAlertActionStyleDestructive
};
@class LQAlertAction;
typedef void(^LQAlertActionHandler)(LQAlertAction *action);

@interface LQAlertAction : NSObject
/**
 LQAlertAction默认初始化方法

 @param title 标题
 @param style 样式(目前没有作用,留作后用)
 @param handler 事件block
 @return LQAlertAction实例
 */
+ (instancetype)alertActionWithTitle:(nullable NSString *)title style:(LQAlertActionStyle)style handler:(nullable LQAlertActionHandler)handler;

@property (nullable ,copy) LQAlertActionHandler handler;
@property (nullable, nonatomic, readonly) NSString *title;
@property (nonatomic, readonly) LQAlertActionStyle style;
@property (nonatomic, getter=isEnabled) BOOL enabled;

@end

LQAlertAction.m

#import "LQAlertAction.h"

@interface LQAlertAction ()
@property (nonatomic, copy) NSString *title;
@property (nonatomic, assign) LQAlertActionStyle style;
@end

@implementation LQAlertAction
+(instancetype)alertActionWithTitle:(NSString *)title style:(LQAlertActionStyle)style handler:(void (^)(LQAlertAction *))handler{
    LQAlertAction *action = [[LQAlertAction alloc]init];
    action.handler = handler;
    action.title = title;
    action.style = style;
    return action;
}
- (NSString *)title{
    if (_title == nil) {
        return @"";
    }
    return _title;
}
- (LQAlertActionStyle)style{
    return _style;
}
@end

3.2 给UIAlertView增加一个分类:
UIAlertView+Extention.h
#import
#import "LQAlertAction.h"
@interface UIAlertView (Extention)
@property (nonatomic, strong) NSArray *actions;

/**
 UIAlertView初始化方法

 @param actions LQAlertAction的数组,默认会有一个取消按钮
 @param title 标题
 @param message 提示信息
 */
+(void)showAlertWithActions:(NSArray *)actions title:(NSString *)title message:(NSString *)message;
@end

UIAlertView+Extention.m
#import "UIAlertView+Extention.h"
#import
@interface UIAlertView ()

@end

@implementation UIAlertView (Extention)
static NSArray *_actions = nil;

+(void)showAlertWithActions:(NSArray *)actions title:(NSString *)title message:(NSString *)message{
    return [[self alloc] showAlertWithActions:actions title:title message:message];
}

-(void)showAlertWithActions:(NSArray *)actions title:(NSString *)title message:(NSString *)message{
    
    NSMutableArray *otherButtonTitle = [[NSMutableArray alloc]init];
    
    NSMutableArray *tempActionArray = [[NSMutableArray alloc] init];//整理action的顺序 0对应的是取消按钮
    LQAlertAction *cancel = [self cancelActionWithTitle:@"取消"];
    [tempActionArray addObject:cancel];
    for (LQAlertAction *action in actions) {
        if (action.style == LQAlertActionStyleCancel) {
            //            cancelButtonTitle = action.title;
            cancel = [self cancelActionWithTitle:action.title];
            break;
        } else {
            [otherButtonTitle addObject:action.title];
            [tempActionArray addObject:action];
        }
        
    }
    
    self.actions = tempActionArray.copy;
    UIAlertView *alert = [self initWithTitle:title message:message delegate:self cancelButtonTitle:cancel.title otherButtonTitles:nil];
    for (NSString *str in otherButtonTitle) {
        [alert addButtonWithTitle:str];
    }
    
    [alert show];
}
- (LQAlertAction *)cancelActionWithTitle:(NSString *)title{
    LQAlertAction *action = [LQAlertAction alertActionWithTitle:title style:LQAlertActionStyleCancel handler:^(LQAlertAction *action) {
        
    }];
    return action;
}


- (void)setActions:(NSArray *)actions{
    objc_setAssociatedObject(self, &_actions, actions, OBJC_ASSOCIATION_RETAIN);
}
- (NSArray *)actions{
    
    return objc_getAssociatedObject(self, &_actions);
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex>self.actions.count-1) {
        return;
    }
    if (self.actions[buttonIndex]) {
        LQAlertAction *action = self.actions[buttonIndex];
        if (action.handler) {
            action.handler(action);
        }
    }
}
-(void)setAlertViewStyle:(UIAlertViewStyle)alertViewStyle{
    
}

三使用范例

代码如下:

LQAlertAction *action1 = [LQAlertAction alertActionWithTitle:@"从相册选取" style:LQAlertActionStyleDefault handler:^(LQAlertAction *action) {
    NSLog(@"打开相册");
}];

LQAlertAction *action2 = [LQAlertAction alertActionWithTitle:@"照相" style:LQAlertActionStyleDefault handler:^(LQAlertAction *action) {
    NSLog(@"打开相机");
}];

LQAlertAction *cancle = [LQAlertAction alertActionWithTitle:@"取消" style:LQAlertActionStyleCancel handler:nil];
[UIAlertView showAlertWithActions:@[action1,action2,cancle] title:@"选取头像" message:@"信息内容"];

四使用范围

目前仅支持UIAlertViewStyle = UIAlertViewStyleDefault的情况,后续视情况增加新的支持

runtime应用--将UIAlertView改造成UIAlertController

一 UIAlertView和UIAlertController的简介

二代码实现:

三使用范例

四使用范围

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runtime应用--将UIAlertView改造成UIAlertController

一 UIAlertView和UIAlertController的简介

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三 使用范例

四 使用范围

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