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  • 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];
    }
    复制代码

    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;

    }

    }
    复制代码

    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>
    {
    // ....
    }
    复制代码
    // 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];
    }
    复制代码
    // 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);
    //}
    复制代码

    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_Switches		0
#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
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  • 原文地址：https://www.cnblogs.com/zhwl/p/2289860.html
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