iOS UI入门——使用Objective-C和Swift实现警告视图和操作列表（UIAlertView，UIActionSheet，UIAlertController）

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警告弹框和操作列表在开发中常用到，iOS9之后，UIAlertView和UIActionSheet都会报黄色的警告，但是还是依然可以使用的。在这里主要介绍一在这三个控件在Objective-C和Swift下的使用代码。

Objective-C代码：

#import "ViewController.h"

@interface ViewController ()<UIAlertViewDelegate,UIActionSheetDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    NSArray * titleArray = @[@"UIAlertView",@"UIActionSheet",@"UIAlertController alertView",@"UIAlertController actionSheet",@"UIAlertController alertView textField"];
    for (int i = 0; i < titleArray.count; i ++) {
        UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(30, 150 + i*60, self.view.frame.size.width - 60, 45);
        button.tag = 300 + i;
        [button setTitle:titleArray[i] forState:UIControlStateNormal];
        button.backgroundColor = [UIColor orangeColor];
        [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];
    }
}

-(void)buttonClick:(UIButton *)button{
    if (button.tag == 300) {
        //UIAlertView
        UIAlertView * alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"你确定要放弃么？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
        [alertView show];
    }else if (button.tag == 301){
        //UIActionSheet
        UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle:@"请选择性别" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"男",@"女", nil];
        [actionSheet showInView:self.view];
    }else if (button.tag == 302){
        //UIAlertController alertView
        UIAlertController * alertView = [UIAlertController alertControllerWithTitle:@"提示" message:@"你确定要放弃么" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction * canclAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            //取消
            NSLog(@"点击了取消按钮");
        }];
        [alertView addAction:canclAction];
        UIAlertAction * okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            //确定
            NSLog(@"点击了确定按钮");
        }];
        [alertView addAction:okAction];
        [self presentViewController:alertView animated:YES completion:nil];
    }else if(button.tag == 303){
        //UIAlertController actionSheet
        UIAlertController * actionSheet = [UIAlertController alertControllerWithTitle:@"选择性别" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
        [actionSheet addAction:[UIAlertAction actionWithTitle:@"男"style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {
            NSLog(@"选择了男");
        }]];

        [actionSheet addAction:[UIAlertAction actionWithTitle:@"女"style:UIAlertActionStyleDefault handler:^(UIAlertAction *_Nonnull action) {
            NSLog(@"选择了女");
        }]];
        [actionSheet addAction:[UIAlertAction actionWithTitle:@"取消"style:UIAlertActionStyleCancel handler:nil]];
        [self presentViewController:actionSheet animated:YES completion:nil];
    }else{
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"请输入密码" message:nil preferredStyle:UIAlertControllerStyleAlert];
        [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
            textField.textColor = [UIColor redColor];
        }];

        [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            NSLog(@"点击了确定按钮");
        }]];

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

#pragma mark - UIAlertViewDelegate
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    //实现UIAlertView的点击事件
    if (buttonIndex == 0) {
        //取消
        NSLog(@"点击了取消按钮");
    }else if (buttonIndex == 1){
        //确定
        NSLog(@"点击了确定按钮");
    }
}

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    //实现UIActionSheet的点击事件
    if (buttonIndex == 0) {
        //取消
        NSLog(@"选择了男");
    }else if (buttonIndex == 1){
        //男
        NSLog(@"选择了女");
    }else if (buttonIndex == 2){
        //女
        NSLog(@"点击了取消按钮");
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Swift代码：

import UIKit

class ViewController: UIViewController,UIAlertViewDelegate,UIActionSheetDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.setupView()
    }

    func setupView() {
        let titleArray = ["UIAlertView","UIActionSheet","UIAlertController alertView","UIAlertController actionSheet","UIAlertController alertView textField"]
        for i in 0...titleArray.count - 1 {
            let button = UIButton.init(type: UIButtonType.custom)
            button.tag = 300 + i
            button.frame = CGRect.init(x: 30, y:(150 + i*60), width:(Int(self.view.frame.size.width - 60)), height: 45)
            button.setTitle(titleArray[i], for: UIControlState.normal)
            button.backgroundColor = UIColor.orange
            button.addTarget(self, action: #selector(buttonClick(_button:)), for:.touchUpInside)
            self.view.addSubview(button)
        }

    }

    @objc func buttonClick(_button:UIButton){
        if _button.tag == 300 {
            //let alertView = UIAlertView.init(title: "提示", message: "你确定要放弃么", delegate: self, cancelButtonTitle: "确定")
            let alertView = UIAlertView.init(title: "提示", message: "你确定要放弃么", delegate: self, cancelButtonTitle: "取消", otherButtonTitles: "再想想","确定")
            alertView.show()
        }else if _button.tag == 301{
            let actionSheet = UIActionSheet.init(title: "请选择性别", delegate: self, cancelButtonTitle: "取消", destructiveButtonTitle:nil, otherButtonTitles: "男", "女")
            actionSheet.show(in: self.view)
        }else if _button.tag == 302{
            let alertView = UIAlertController.init(title: "提示", message: "你确定要放弃么", preferredStyle: UIAlertControllerStyle.alert)
            let cancelAction = UIAlertAction.init(title: "取消", style: UIAlertActionStyle.cancel) { (action:UIAlertAction) in
                //取消
                print("点击了取消")
            }
            alertView.addAction(cancelAction)
            let thinkAction = UIAlertAction.init(title: "再想想", style: UIAlertActionStyle.default) { (action:UIAlertAction) in
                //再想想
                print("点击了再想想")
            }
            alertView.addAction(thinkAction)
            let okAction = UIAlertAction.init(title: "确定", style: UIAlertActionStyle.destructive) { (action:UIAlertAction) in
                //确定
                print("点击了确定")
            }
            alertView.addAction(okAction)
            self.present(alertView, animated: true, completion: nil)
        }else if _button.tag == 303{
            let actionSheet = UIAlertController.init(title: "请选性别", message: nil, preferredStyle: UIAlertControllerStyle.actionSheet)
            let cancelAction = UIAlertAction.init(title: "取消", style: UIAlertActionStyle.cancel) { (action:UIAlertAction) in
                //取消
                print("点击了取消")
            }
            actionSheet.addAction(cancelAction)
            let boyAction = UIAlertAction.init(title: "男", style: UIAlertActionStyle.default) { (action:UIAlertAction) in
                //男
                print("点击了男")
            }
            actionSheet.addAction(boyAction)
            let girlAction = UIAlertAction.init(title: "女", style: UIAlertActionStyle.default) { (action:UIAlertAction) in
                //女
                print("点击了女")
            }
            actionSheet.addAction(girlAction)
            self.present(actionSheet, animated: true, completion: nil)
        }else{
            let alertTextField = UIAlertController.init(title: "请输入密码", message: nil, preferredStyle: UIAlertControllerStyle.alert)
            alertTextField.addTextField { (textField:UITextField) in
                textField.isSecureTextEntry = true
            }
            let okAction = UIAlertAction.init(title: "确定", style: UIAlertActionStyle.destructive) { (action:UIAlertAction) in
                //确定
                print("点击了确定")
            }
            alertTextField.addAction(okAction)
            self.present(alertTextField, animated: true, completion: nil)
        }
    }

    //MARK:-UIAlertViewDelegate
    func alertView(_ alertView: UIAlertView, clickedButtonAt buttonIndex: Int) {
        if buttonIndex == 0 {
            //取消
            print("点击了取消")
        }else if buttonIndex == 1 {
            //再想想
            print("点击了再想想")
        }else if buttonIndex == 2 {
            //确定
            print("点击了确定")
        }
    }

    //MARK:-UIActionSheetDelegate
    func actionSheet(_ actionSheet: UIActionSheet, clickedButtonAt buttonIndex: Int) {
        if buttonIndex == 0 {
            //取消
            print("点击了取消")
        }else if buttonIndex == 1 {
            //男
            print("点击了男")
        }else if buttonIndex == 2{
            //女
            print("点击了女")
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

以上给出的代码都是完整代码，复制粘贴可用~