最近剛?cè)胧謱W(xué)習(xí)IOS轩拨，第一個(gè)教程用的是《讓不懂編程的人愛上iPhone開發(fā)(2013 iOS7版)践瓷，其中當(dāng)選擇在IOS 9.x deploy的時(shí)候，教程中UIAlertView已經(jīng)不再適用亡蓉，提示要用UIAlertController替代晕翠，所以學(xué)習(xí)了一下，特在此記錄砍濒。

這次學(xué)習(xí)主要參考了：
Ammar 的 簡書文章
一篇博客：博客

#import"ViewController.h"
@interfaceViewController()
- (IBAction)showAlert:(id)sender;
@end
- (IBAction)showAlert:(id)sender {
//下面內(nèi)容的代碼是放置在這里的
}

UIAlertControllerStyle有兩種：Alert(對話框), Sheet(上拉菜單)

UIAlertControllerStyleAlert 和 UIAlertControllerStyleActionSheet

UIAlertActionStyle 有三種：Default(常規(guī)), Cancel(取消), Destructive(警示)

UIAlertActionStyleDefault, UIAlertActionStyleCancel, UIAlertActionStyleDestructive

現(xiàn)在看下面枚舉的組合例子：

1 UIAlertControllerStyleAlert (對話框) 添加常規(guī)（okAction) 和 取消（cancelAction) 按鈕：

UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Hi, Warrior!" message:@"Welcome To The Drag World" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction* okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];

UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDestructive handler:nil];

[alert addAction: okAction];

[alert addAction: cancelAction];
//呈現(xiàn)視圖
[self presentViewController:alert animated:YES completion:nil];

default & cancel

2 UIAlertControllerStyleAlert (對話框) 添加常規(guī)(okAction) 和警示(destructiveAction) 按鈕：

只需要在上面代碼中把UIAlertActionStyleCancel 替換成 UIAlertActionStyleDestructive.

default & destructive

3 UIAlertControllerStyleActionSheet (上拉菜單)添加常規(guī)崖面，取消和警示按鈕梯影， 其中UIAlertActionStyleCancel 的UIAlertAction對象只能有一個(gè)巫员，從顯示中可以明顯看出來：

UIAlertController* alert = [UIAlertControlleralertControllerWithTitle:@"Hi, Warrior!"message:@"Welcome To The Drag World"preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction* okAction = [UIAlertActionactionWithTitle:@"OK"style:UIAlertActionStyleDefaulthandler:nil];

UIAlertAction* cancelAction = [UIAlertActionactionWithTitle:@"Cancel"style:UIAlertActionStyleCancelhandler:nil];

UIAlertAction* destructiveAction = [UIAlertActionactionWithTitle:@"Cancel"style:UIAlertActionStyleDestructivehandler:nil];

[alertaddAction: cancelAction];

[alertaddAction: okAction];

[alertaddAction: destructiveAction];

[self presentViewController:alert animated:YES completion:nil];

sheet

4 帶文本輸入框的對話框: 使用addTextFieldWithConfigurationHandler
例如：

UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Hi, Warrior!" message:@"Welcome To The Drag World" preferredStyle:UIAlertControllerStyleAlert];
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField){
        //配置輸入框內(nèi)的占位符
        textField.placeholder=@"Username";
        //設(shè)置輸入框的背景顏色简识，其中這里RGB參數(shù)的設(shè)置范圍不是0-255，而是0.0-1.0, alpha 是指背景透明度感猛，0.0為全透明七扰，1.0不透明
        textField.backgroundColor = [UIColor colorWithRed:111.0/255 green:206.0/255 blue:250.0/255 alpha:0.5];
}];
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textFiled){
        textFiled.placeholder=@"Password";
        //設(shè)置密碼的使用安全文本輸入
        textFiled.secureTextEntry=YES;}];
    
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
            }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *deleteAction = [UIAlertAction actionWithTitle:@"Delete" style:UIAlertActionStyleDestructive handler:nil];
    
    [alert addAction: okAction];
    [alert addAction: cancelAction];
    [alert addAction: deleteAction];
    
    [self presentViewController:alert animated:YES completion:nil ];

帶輸入框的對話框