iOS开发从入门到精通-- 警告对话框UIAlertView和等待提示器UIActivityIndicatorView

来源：互联网发布：unity3d 模拟重力跳跃编辑：程序博客网时间：2024/05/17 03:26

警告对话框UIAlertView和等待提示器UIActivityIndicatorView:
1.UIAlertView简单一点就是弹框
2.就是所谓的菊花转圈圈

这里写图片描述

声明：注意@interface ViewController : UIViewController<UIAlertViewDelegate>这个里面多了一个UIAlertViewDelegate代理

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIAlertViewDelegate>{    //定义一个警告对话框视图对象    UIAlertView * _alertView;    //等待提示对象    //当下载，或者加载比较大的文件时，可以显示此控件，处于提示等待状态    UIActivityIndicatorView * _activityIndicator;}@property(retain,nonatomic) UIAlertView * alertView;@property(retain,nonatomic) UIActivityIndicatorView * activityIndicator;@end

实现：

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController//实现属性和成员变量的同步@synthesize alertView =_alertView;@synthesize activityIndicator=_activityIndicator;- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    for(int i=0;i<2;i++){        UIButton * btn =[UIButton buttonWithType:UIButtonTypeRoundedRect];        btn.frame = CGRectMake(100, 100+100*i, 100, 40);        if(i==0){            [btn setTitle:@"警告对话框" forState:UIControlStateNormal];        }        else if(i==1){            [btn setTitle:@"等待指示器" forState:UIControlStateNormal];        }        btn.tag = 101+i;        [btn addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];        [self.view addSubview:btn];    }}-(void) pressBtn:(UIButton*) btn{    //警告对话框创建    //p1:对话框标题    //p2:提示信息    //p3:处理按钮事件的代理对象    //p4:取消按钮的文字,默认的索引为0；    //p5:其他按钮文字 ** otherButtonTitles:@"确定", nil]; 只有取消和确定按钮是横向排开    // otherButtonTitles:@"确定",@"确定1",@"确定2", nil];这样子就会全部纵向排开，索引依次是1，2，3.    //p6:...:添加其他按钮    //nil:表示按钮添加结束    if(btn.tag==101){        _alertView = [[UIAlertView alloc]initWithTitle:@"警告"                                               message:@"你的手机电量过低，请保存数据"                                              delegate:self                                     cancelButtonTitle:@"取消"                                     otherButtonTitles:@"确定", nil];        //显示对话框        [_alertView show];    }    //创建等待提示器，大伙都叫他菊花    else if(btn.tag==102){        //创建等待提示器，宽高不可变更        _activityIndicator =[[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(100, 300, 80, 80)];        //设定提示的风格:小灰，小白，大白        _activityIndicator.activityIndicatorViewStyle =UIActivityIndicatorViewStyleGray;//小灰//        _activityIndicator.activityIndicatorViewStyle=UIActivityIndicatorViewStyleWhite;//小白//        //        _activityIndicator.activityIndicatorViewStyle=UIActivityIndicatorViewStyleWhiteLarge;//大白//        self.view.backgroundColor=[UIColor blueColor];        [self.view addSubview:_activityIndicator];        //启动动画并显示        [_activityIndicator startAnimating];        //停止等待动画并隐藏//        [_activityIndicator stopAnimating];    }}//当点击对话框的按钮时，调用此函数//p1:对话框对象本身//p2:按钮的索引-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    NSLog(@"index=%ld\n",buttonIndex);}//对话框即将消失，此函数被调用-(void) alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"即将消失！");}//对话框已经消失时，调用此函数-(void) alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"已经消失");}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

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