iPhone起步-2:iPhone常用控件、UIActionSheet、UIAlertView (转)

一、UILabel

 

 

二、UIButton

 

常用事件：Touch Up Inside

 

三、UITextField

 

常用属性：

Text:要显示的文本。

Placeholder:指定将要在文本字段中以灰色显示的占位符文本。

Clear When Editing Begins:用户触摸此字段时是否删除字段中的值。

Text Input Traits:文本输入特征。

 

四、UIImageView

 

常用属性：

image:指定图像文件

Mode:图像在视图内部的对齐方式以及是否缩放图像以适应视图。选择任何图像缩放的选项都会潜在地增加处理开销，因此最好避开这些选项，并在导入图像之前调整好图像大小。通常Mode属性为Center。

Alpha：图像透明度。一般设置为1.0

Background:该属性继承自UIView，但它不会影响图像视图的外观，请忽略此属性。

Drawing复选框：选中Opaque表示视图后面的任何内容都不应该绘制，并且允许iPhone都绘图方法通过一些优化来加速绘图。

Clear Context Before Drawing:选中它之后，iPhone将使用透明黑色绘制控件覆盖都所有区域，然后才实际绘制控件。考虑到性能问题，并且适用情况很少，通常很少需要选中ClearContext Before Drawing。

Interaction复选框：

User Interaction Enabled:指定用户能否对此对象进行操作。

Multiple Touch：是否能够接收多点触摸事件。

 

五：UISlider(滑块)

 

常用属性：Value Changed

示例：

// 将silder的值反映到sliderLabel

- (IBAction) sliderValueChanged: (id)sender

{

　　　　UISlider *slider = (UISlider *)sender;

　　　　int progressAsInt = (int)(slider.value + 0.5f);

　　　　NSString *newText = [[NSStringalloc] initWithFormat:@"%d", progressAsInt];

　　　　sliderLabel.text = newText;

　　　　[newText release];

} 

 

六：UISwitch(开关)

 

代码

// 属性on：获取开关的状态是否为on
// 方法setOn：设置开关的状态
- (IBAction) switchChanged: (id)sender
{
UISwitch *whichSwitch = (UISwitch *)sender;
BOOL setting = whichSwitch.on;
[leftSwitch setOn:setting animated:YES];
[rightSwitch setOn:setting animated:YES];
}

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七、UISegmentedControl

#define kSegmentIndex_Switches 0
#define kSegmentIndex_Button 1

- (IBAction) segmentChanged: (id)sender
{
switch ([sender selectedSegmentIndex]) 
{
case kSegmentIndex_Switches:
leftSwitch.hidden = NO;
rightSwitch.hidden = NO;
doSomethingButton.hidden = YES;
break;
case kSegmentIndex_Button:
leftSwitch.hidden = YES;
rightSwitch.hidden = YES;
doSomethingButton.hidden = NO;
break; 

}

}

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八、UIActionSheet（操作表）和UIAlertView（警报）

UIActionSheet用于迫使用户在两个或更多选项之间进行选择都模式视图。操作表从屏幕底部弹出，显示一系列按钮供用户选择，用户只有单击了一个按钮后才能继续使用使用应用程序。

UIAlertView（警报）以蓝色圆角矩形都形式出现在屏幕的中部，警报可显示一个或多个按钮。

为了让控制器类充当操作表的委托，控制器类需要遵从UIActionSheetDelegate协议。我们通过在类声明都超类之后都尖括号中添加协议名称来实现。

 

@interface UntitledViewController : UIViewController
<UIActionSheetDelegate>
{
// ....
}

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// 创建操作表：
- (IBAction) buttonPressed: (id)sender
{
UIActionSheet *actionSheet = [[UIActionSheet alloc] 
initWithTitle:@"Are you sure?"
delegate:self 
cancelButtonTitle:@"Cancel" 
destructiveButtonTitle:@"Yes,I'm sure." 
otherButtonTitles:nil];

[actionSheet showInView:self.view];
[actionSheet release];
}

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// 实现方法：
#pragma mark ActionSheet Delegate Methods
- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{

if (buttonIndex != [actionSheet cancelButtonIndex])
{
NSString *text = [[NSString alloc] initWithFormat:@"test alert"];
UIAlertView *alert = [[UIAlertView alloc] 
initWithTitle:@"Something was done." 
message:text 
delegate:self 
cancelButtonTitle:@"OK!" 
otherButtonTitles:nil];
[alert show];
[alert release];
[text release];
}
}

//- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
//{
// NSLog(@"%d",buttonIndex);
//}

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示例：

视图有一个UISegmentedControl,"Switches"下有两个UISwitch

"Button"下有一个“Do Something"的UIButton

触摸"Do Something"Button时弹出UIActionSheet

触摸选择"Yes,I'm sure."时弹出 UIAlertView

OBJECTIVE-C CODE   :UntitledViewController.h

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////  UntitledViewController.h//  Untitled////  Created by Elf Sundae on 11/10/10.//  Copyright 2010 www.cnBlogs.com/ElfSundae. All rights reserved.//#import <UIKit/UIKit.h>#define kSegmentIndex_Switches0#define kSegmentIndex_Button　　  1@interface UntitledViewController : UIViewController<UIActionSheetDelegate>{UISwitch* leftSwitch;UISwitch* rightSwitch;UIButton* doSomethingButton;}@property (retain, nonatomic) IBOutlet UISwitch *leftSwitch;@property (retain, nonatomic) IBOutlet UISwitch *rightSwitch;@property (retain, nonatomic) IBOutlet UIButton *doSomethingButton;- (IBAction) switchChanged: (id)sender;- (IBAction) segmentChanged: (id)sender;- (IBAction) buttonPressed: (id)sender;@end

 

OBJECTIVE-C CODE   :UntitledViewController.m

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////  UntitledViewController.m//  Untitled////  Created by Elf Sundae on 11/10/10.//  Copyright 2010 www.cnBlogs.com/ElfSundae. All rights reserved.//#import "UntitledViewController.h"@implementation UntitledViewController@synthesize leftSwitch;
@synthesize rightSwitch;
@synthesize doSomethingButton;

// 属性on：获取开关的状态是否为on// 方法setOn：设置开关的状态- (IBAction) switchChanged: (id)sender
{
UISwitch *whichSwitch = (UISwitch *)sender;
BOOL setting = whichSwitch.on;
[leftSwitch setOn:setting animated:YES];
[rightSwitch setOn:setting animated:YES];
}


- (IBAction) segmentChanged: (id)sender
{
switch ([sender selectedSegmentIndex]) 
{
case kSegmentIndex_Switches:leftSwitch.hidden = NO;
rightSwitch.hidden = NO;
doSomethingButton.hidden = YES;
break;
case kSegmentIndex_Button:leftSwitch.hidden = YES;
rightSwitch.hidden = YES;
doSomethingButton.hidden = NO;
break;

}


}


- (IBAction) buttonPressed: (id)sender
{
UIActionSheet *actionSheet = [[UIActionSheet alloc] 
      initWithTitle:@"Are you sure?"      delegate:self 
      cancelButtonTitle:@"Cancel" 
      destructiveButtonTitle:@"Yes,I'm sure." 
      otherButtonTitles:nil];

[actionSheet showInView:self.view];
[actionSheet release];
}

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.[super didReceiveMemoryWarning];// Release any cached data, images, etc that aren't in use.}- (void)viewDidUnload {
// Release any retained subviews of the main view.// e.g. self.myOutlet = nil;self.leftSwitch = nil;
self.rightSwitch = nil;
self.doSomethingButton = nil;
[super viewDidUnload];
}


- (void)dealloc {
[leftSwitch release];
[rightSwitch release];
[doSomethingButton release];
[super dealloc];
}


#pragma mark -#pragma mark ActionSheet Delegate Methods- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{

if (buttonIndex != [actionSheet cancelButtonIndex])
{
NSString *text = [[NSString alloc] initWithFormat:@"test alert"];
UIAlertView *alert = [[UIAlertView alloc] 
      initWithTitle:@"Something was done." 
      message:text 
      delegate:self 
      cancelButtonTitle:@"OK!" 
      otherButtonTitles:nil];
[alert show];
[alert release];
[text release];
}
}

//- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex//{//NSLog(@"%d",buttonIndex);//}@end