本文旨在将UIAlertView改造,使UIAlertView的用法类似UIAlertController,使得代码逻辑更加清晰化,方便阅读和维护.
目录
一 UIAlertView和UIAlertController的简介
二 具体代码实现
三 使用范例
四 适用范围
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<UIAlertViewDelegate>
@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 /*<UIAlertViewDelegate>*/)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 <UIKit/UIKit.h>
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 <UIKit/UIKit.h>
#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 <objc/runtime.h>
@interface UIAlertView ()<UIAlertViewDelegate>
@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
