iOS 弹窗UIAlertView、UIActionSheet、UIAlertController简述 —— HERO博客

UIAlertView:

在屏幕中间的弹窗，可以设置标题、详细信息、按钮文字及个数。


 


如图27-1、27-2，只设置了一个取消按钮和多添加一个确认按钮的效果。仍然可以继续添加按钮，按钮会纵向向下排列。需要通过代理设置其他按钮点击事件，否则点击仍是取消效果。Title、Message为nil时不显示。下面贴上相关代码：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#import "ViewController.h"

@interface ViewController ()<UIAlertViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor blackColor];

//创建控件
[self creatContorl];
}

- (void)creatContorl
{
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 150, 100, 30)];
btn.backgroundColor = [UIColor orangeColor];
[btn setTitle:@"测试按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnOnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnOnClick
{
//初始化
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"这是Title" message:@"这是Message" delegate:self cancelButtonTitle:@"取消按钮" otherButtonTitles:@"其他按钮1", @"其他按钮2", @"其他按钮3", nil];
//显示alertView
[alert show];
}

#pragma mark - UIAlertViewDelegate
//根据被点击按钮的索引处理点击事件
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"clickButtonAtIndex:%ld", buttonIndex);
}

//AlertView取消按钮点击事件
-(void)alertViewCancel:(UIAlertView *)alertView
{
NSLog(@"alertViewCancel");
}

//AlertView即将显示时调用
-(void)willPresentAlertView:(UIAlertView *)alertView
{
NSLog(@"willPresentAlertView");
}

//AlertView已经显示时调用
-(void)didPresentAlertView:(UIAlertView *)alertView
{
NSLog(@"didPresentAlertView");
}

//ALertView即将消失时调用
-(void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
{
NSLog(@"willDismissWithButtonIndex");
}

//AlertView已经消失时调用
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
NSLog(@"didDismissWithButtonIndex");
}

@end

UIActionSheet:

在屏幕底部的弹窗，可以设置标题、按钮文字及个数。


 


如图27-3，一个UIActionSheet弹窗效果。可以添加多个按钮，需要通过代理设置其他按钮点击事件，否则点击仍是取消效果。如图27-4，Title、cancelButtonTitle、destructiveButtonTitle、otherButtonTitles为nil时不显示。下面贴上相关代码：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#import "ViewController.h"

@interface ViewController ()<UIActionSheetDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor blackColor];

//创建控件
[self creatContorl];
}

- (void)creatContorl
{
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 250, 100, 30)];
btn.backgroundColor = [UIColor orangeColor];
[btn setTitle:@"测试按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnOnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnOnClick
{
//初始化
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"这是title" delegate:self cancelButtonTitle:@"取消按钮" destructiveButtonTitle:@"确定按钮" otherButtonTitles:@"其他按钮1", @"其他按钮2", nil];
//在self.view中显示弹窗
[actionSheet showInView:self.view];
}

#pragma mark - UIActionSheetDelegate
//根据被点击按钮的索引处理点击事件
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(@"clickButtonAtIndex:%ld", buttonIndex);
}

//弹窗视图即将显示时调用
- (void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
NSLog(@"willPresentActionSheet");
}

//弹窗视图已经显示时调用
- (void)didPresentActionSheet:(UIActionSheet *)actionSheet
{
NSLog(@"didPresentActionSheet");
}

//弹窗视图即将消失时调用
- (void)actionSheet:(UIActionSheet *)actionSheet willDismissWithButtonIndex:(NSInteger)buttonIndex
{
NSLog(@"willDismissWithButtonIndex");
}

//弹窗视图已经消失时调用
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
NSLog(@"didDismissWithButtonIndex");
}

@end

UIAlertController:

iOS8推出的新controller，替代了UIAlertView和UIActionSheet，但UIAlertView和UIActionSheet仍可以使用。UIAlertController可以添加输入框，操作更加简便、灵活。


 


如图27-5，一个UIAlertControllerStyleAlert类型弹窗效果。可以添加多个按钮，设置按钮点击后block事件。如图27-6，一个UIAlertControllerStyleActionSheet类型弹窗效果。下面贴上相关代码：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor blackColor];

//创建控件
[self creatContorl];
}

- (void)creatContorl
{
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(50, 50, 100, 30)];
btn.backgroundColor = [UIColor orangeColor];
[btn setTitle:@"测试按钮" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnOnClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnOnClick
{
//初始化
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"这是title" message:@"这是message" preferredStyle:UIAlertControllerStyleAlert];

//创建按钮
UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确认按钮" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"确认按钮block");
//取出输入框文字
    UITextField *login = alertController.textFields.firstObject;
    UITextField *password = alertController.textFields.lastObject;
NSLog(@"loginText:%@, passwordText:%@", login.text, password.text);
}];
//取消按钮（只能创建一个）
UIAlertAction *cancelAction =
b98c
[UIAlertAction actionWithTitle:@"取消按钮" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消按钮block");
}];
//警告按钮
UIAlertAction *structAction = [UIAlertAction actionWithTitle:@"警告按钮" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"警告按钮block");
}];

//将按钮添加到UIAlertController对象上
[alertController addAction:sureAction];
[alertController addAction:cancelAction];
[alertController addAction:structAction];

//添加文本框（只能在UIAlertController的UIAlertControllerStyleAlert样式下添加）
[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"请输入账号";
textField.secureTextEntry = YES;
}];
[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
textField.placeholder = @"请输入密码";
textField.secureTextEntry = YES;
}];

//显示弹窗视图控制器
[self presentViewController:alertController animated:YES completion:nil];
}

@end