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//
// ViewController.m
// AlertController
//
// Created by ad on 10/03/2017.
//
// 详细介绍： https://github.com/pro648/tips/wiki/UIAlertController%E7%9A%84%E4%BD%BF%E7%94%A8
#import "ViewController.h"
@interface ViewController ()
- (IBAction)showAlertView:(UIButton *)sender;
- (IBAction)showLoginAlertView:(UIButton *)sender;
- (IBAction)showActionSheet:(UIButton *)sender;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// app进入后台后隐藏警报控制器
[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidEnterBackgroundNotification
object:nil
queue:nil
usingBlock:^(NSNotification * _Nonnull note) {
[self.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}];
}
- (void)dealloc
{
// 移除观察者
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark -
#pragma mark IBAction
- (IBAction)showAlertView:(UIButton *)sender
{
// 1.创建UIAlertController
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Alert Title"
message:@"The message is ..."
preferredStyle:UIAlertControllerStyleAlert];
// 2.创建并添加按钮
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"OK Action");
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"Cancel Action");
}];
UIAlertAction *resetAction = [UIAlertAction actionWithTitle:@"Reset" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"Reset Action");
}];
[alertController addAction:cancelAction]; // B
[alertController addAction:okAction]; // A
[alertController addAction:resetAction]; // C
// 3.呈现UIAlertContorller
[self presentViewController:alertController animated:YES completion:nil];
}
- (IBAction)showLoginAlertView:(UIButton *)sender
{
// 1.创建UIAlertController
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Login"
message:@"Enter Your Account Info Below"
preferredStyle:UIAlertControllerStyleAlert];
// 2.1 添加文本框
[alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"username";
[textField addTarget:self action:@selector(alertUserAccountInfoDidChange:) forControlEvents:UIControlEventEditingChanged]; // 添加响应事件
}];
[alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.placeholder = @"password";
textField.secureTextEntry = YES;
[textField addTarget:self action:@selector(alertUserAccountInfoDidChange:) forControlEvents:UIControlEventEditingChanged]; // 添加响应事件
}];
// 2.2 创建Cancel Login按钮
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"Cancel Action");
}];
UIAlertAction *loginAction = [UIAlertAction actionWithTitle:@"Login" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
UITextField *userName = alertController.textFields.firstObject;
UITextField *password = alertController.textFields.lastObject;
// 输出用户名 密码到控制台
NSLog(@"username is %@, password is %@",userName.text,password.text);
}];
// 2.3 添加按钮
loginAction.enabled = NO; // 禁用Login按钮
[alertController addAction:cancelAction];
[alertController addAction:loginAction];
// 3.显示警报控制器
[self presentViewController:alertController animated:YES completion:nil];
}
- (IBAction)showActionSheet:(UIButton *)sender
{
// 1.创建UIAlertController
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Action Sheet"
message:@"Deleted data can't be restored"
preferredStyle:UIAlertControllerStyleActionSheet];
// 2.1 创建按钮
UIAlertAction *deleteAction = [UIAlertAction actionWithTitle:@"Delete" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"Delete Action");
}];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"Cancel Action");
}];
// 2.2 添加按钮
[alertController addAction:deleteAction];
[alertController addAction:cancelAction];
UIPopoverPresentationController *popover = alertController.popoverPresentationController;
if (popover)
{
popover.sourceView = sender;
popover.sourceRect = sender.bounds;
popover.permittedArrowDirections = UIPopoverArrowDirectionAny;
}
// 3.显示警报控制器
[self presentViewController:alertController animated:YES completion:nil];
}
#pragma mark -
#pragma mark IBAction
- (void)alertUserAccountInfoDidChange:(UITextField *)sender
{
UIAlertController *alertController = (UIAlertController *)self.presentedViewController;
if (alertController)
{
NSString *userName = alertController.textFields.firstObject.text;
NSString *password = alertController.textFields.lastObject.text;
UIAlertAction *loginAction = alertController.actions.lastObject;
if (userName.length > 3 && password.length > 6)
// 用户名大于3位，密码大于6位时，启用Login按钮。
loginAction.enabled = YES;
else
// 用户名小于等于3位，密码小于等于6位，禁用Login按钮。
loginAction.enabled = NO;
}
}
@end