UIAlertView的基本使用(三)

參考前篇的文件，改良原來的實作，增加了一個stepper在第二個alertView上，並讓兩個alertView有不同的大小與位置，形態也不相同。

修改原先的實作，來表現特殊效果如下

1. 加入一個Button及一個label到storyboard上

2. 在mainViewControlller.h上註冊新的元件
#import <UIKit/UIKit.h>

@interface mainViewController : UIViewController

@property (nonatomic)  NSString  *text;
@property (weak, nonatomic) IBOutlet UILabel *textLabel;

@property (nonatomic) UIStepper *stepper2;
@property (weak, nonatomic) IBOutlet UILabel *stepper2Label;

@property (nonatomic) UILabel *insideLabel;

@end

3. 在mainViewController.m加上新的程式碼
#import "mainViewController.h"

@interface mainViewController ()

@end

@implementation mainViewController

@synthesize text;

@synthesize textLabel;

@synthesize stepper2;
@synthesize stepper2Label;
@synthesize insideLabel;

int value=0;
int alertNumber = 0;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (IBAction)showAlertView:(id)sender {
  
    alertNumber = 0;
   
    [self alertViewAction1];
   
}

- (IBAction)dataInput:(id)sender {

    alertNumber = 1;
   
    [self alertViewAction2];
   
}

- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    switch (buttonIndex) {
        case 0:
           
            if (alertNumber == 0)
               text = @"Cancel Button Pressed";
           
            break;
        case 1:
            text =  @"Button 1 Pressed";
            break;
        case 2:
            text = @"Button 2 Pressed";
            break;
        case 3:
            text = @"Button 3 Pressed";
            break;
        default:
            break;
    }
   
    if (alertNumber == 0)
       textLabel.text = text;
    else
        stepper2Label.text = text;
   
}

- (void) willPresentAlertView:(UIAlertView *)alertView{
    
    // alertView的大小位置，只能在此處設定
    if (alertNumber ==0)
       alertView.frame = CGRectMake(360.0f, 350.0f, 300.0f, 350.0f);
    else
       alertView.frame = CGRectMake(250, 650.0f, 280.0f, 180.0f);

}



- (void) stepperValueIschanged
{
    text = [NSString stringWithFormat:@"Stepper2 Value = %2.2f", stepper2.value];
   
    stepper2Label.text = text;
   
    insideLabel.text = text;
   
}


- (void) alertViewAction1
{
    UIAlertView *alert1 = [[UIAlertView alloc] initWithTitle:@"Title" message:@"Message 1......\nMessage 2......" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Button 1", @"Button 2", @"Button 3", nil];
   
    [alert1 show];
   
}


- (void) alertViewAction2
{
   
    UIAlertView *alert2 = [[UIAlertView alloc] initWithTitle:@"Stepper Input"
                                                     message:@"\n\n\n" // IMPORTANT 製造空白區
                                                    delegate:self  // call
                                           cancelButtonTitle:@"取消"
                                           otherButtonTitles:@"選擇", nil];
   
 
    insideLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 250, 20)];
   
    //資源分配與位置設定
    stepper2 = [[UIStepper alloc] init];
   
    // size value are ignore，注意大小不能設定，因此設為任何值都可以，此處為0
    [stepper2 setFrame:CGRectMake(80,60 , 0, 0)];
   
    //設定stepper的範圍與起始值
    [stepper2 setMaximumValue:10.0];
    [stepper2 setMinimumValue:0.0];
    [stepper2 setValue:5.5];
   
    //設定stepper每次增減的值
    [stepper2 setStepValue:0.1];
   
    //設定stepper可以按住不放來連續更改數值
    [stepper2 setContinuous:YES];
   
    //設定stepper是否循環（到最大值時再增加數值最從最小值開始）
    [stepper2 setWraps:YES];
   
    //將stepper加入UIControlEventValueChanged的觸發事件中並設定觸發時所處理的函式
    [stepper2 addTarget:self action:@selector(stepperValueIschanged) forControlEvents:UIControlEventValueChanged];
   
    [alert2 addSubview:stepper2];
   
    [alert2 addSubview:insideLabel];
   
    // 向上移動110點，平移設定
    [alert2 setTransform:CGAffineTransformMakeTranslation(0.0, 110.0)];
   
    //alertNumber = 1;
   
    [alert2 show];
   

}

@end

4. 執行結果