iOS開發從入門到精通-- 警告對話方塊UIAlertView和等待提示器UIActivityIndicatorView

標籤：

警告對話方塊UIAlertView和等待提示器UIActivityIndicatorView:
1.UIAlertView簡單一點就是彈框
2.就是所謂的菊花轉圈圈

聲明：注意@interface ViewController : UIViewController<UIAlertViewDelegate>這個裡面多了一個UIAlertViewDelegate代理

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIAlertViewDelegate>{    //定義一個警告對話方塊視圖對象    UIAlertView * _alertView;    //等待提示對象    //當下載，或者載入比較大的檔案時，可以顯示此控制項，處於提示等待狀態    UIActivityIndicatorView * _activityIndicator;}@property(retain,nonatomic) UIAlertView * alertView;@property(retain,nonatomic) UIActivityIndicatorView * activityIndicator;@end

實現：

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController//實現屬性和成員變數的同步@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:@"警告對話方塊" forState:UIControlStateNormal];        }        else if(i==1){            [btn setTitle:@"等待指標" forState:UIControlStateNormal];        }        btn.tag = 101+i;        [btn addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];        [self.view addSubview:btn];    }}-(void) pressBtn:(UIButton*) btn{    //警告對話方塊建立    //p1:對話方塊標題    //p2:提示資訊    //p3:處理按鈕事件的代理對象    //p4:取消按鈕的文字,預設的索引為0；    //p5:其他按鈕文字 ** otherButtonTitles:@"確定", nil]; 只有取消和確定按鈕是橫向排開    // otherButtonTitles:@"確定",@"確定1",@"確定2", nil];這樣子就會全部縱向排開，索引依次是1，2，3.    //p6:...:添加其他按鈕    //nil:表示按鈕添加結束    if(btn.tag==101){        _alertView = [[UIAlertView alloc]initWithTitle:@"警告"                                               message:@"你的手機電量過低，請儲存資料"                                              delegate:self                                     cancelButtonTitle:@"取消"                                     otherButtonTitles:@"確定", nil];        //顯示對話方塊        [_alertView show];    }    //建立等待提示器，大夥都叫他菊花    else if(btn.tag==102){        //建立等待提示器，寬高不可變更        _activityIndicator =[[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(100, 300, 80, 80)];        //設定提示的風格: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];        //啟動動畫並顯示        [_activityIndicator startAnimating];        //停止等待動畫並隱藏//        [_activityIndicator stopAnimating];    }}//當點擊對話方塊的按鈕時，調用此函數//p1:對話方塊對象本身//p2:按鈕的索引-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    NSLog(@"index=%ld\n",buttonIndex);}//對話方塊即將消失，此函數被調用-(void) alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"即將消失！");}//對話方塊已經消失時，調用此函數-(void) alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"已經消失");}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

iOS開發從入門到精通-- 警告對話方塊UIAlertView和等待提示器UIActivityIndicatorView