iphone开发之常用控件的使用详解

iphone与android一样都包含一些常见的控件比如按钮，图片控件（ImageView）、TableViewController（android下为listView）、标签（android下为TextView）、进度条等。今天我们就来学习一下这些控件的使用。

新建一个基于View的项目，添加下图中的控件

我们添加了Label、TextField、Slider、SwitchButton、ToggleButton控件。下面我们需要为TextField和Label控件（显示Slider值的控件图中35）设置输出口以及为按钮设置事件监听。不要忘了将控件与输出口及事件建立连接，方法：按住Control从File's owner 拖到控件，这时会弹出相关的输出口或事件。

在ViewController文件中加入一下代码：

<UIActionSheetDelegate>{    }@property (nonatomic, retain) IBOutlet UITextField *nameField;@property (nonatomic, retain) IBOutlet UITextField *passField;@property (nonatomic, retain) IBOutlet UILabel *sliderLabel;@property (nonatomic, retain) IBOutlet UISwitch *leftSwitch;@property (nonatomic, retain) IBOutlet UISwitch *rightSwitch;@property (nonatomic, retain) IBOutlet UIButton *doSomethingBtn;- (IBAction)toggleControls:(id)sender;- (IBAction)switchChanged:(id)sender;- (IBAction)buttonPressed:(id)sender;- (IBAction)textFieldDoneEditing:(id)sender;- (IBAction)backgroundTap:(id)sender;- (IBAction)sliderChanged:(id)sender;

修改ViewController.m文件如下：

#import "ViewController.h"@implementation ViewController@synthesize nameField;@synthesize passField;@synthesize sliderLabel;@synthesize leftSwitch;@synthesize rightSwitch;@synthesize doSomethingBtn;- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Release any cached data, images, etc that aren't in use.}- (IBAction)toggleControls:(id)sender{    if([sender selectedSegmentIndex] == kSwichesSegmentIndex){        leftSwitch.hidden = NO;        rightSwitch.hidden = NO;        doSomethingBtn.hidden = YES;    }else{        leftSwitch.hidden = YES;        rightSwitch.hidden = YES;        doSomethingBtn.hidden = NO;    }}- (IBAction)switchChanged:(id)sender{    UISwitch *whichSwitch = (UISwitch *)sender;    BOOL setting = whichSwitch.isOn;    [leftSwitch setOn:setting animated:YES];    [rightSwitch setOn:setting animated:YES];}- (IBAction)buttonPressed:(id)sender{    UIActionSheet *actionSheet = [[UIActionSheet alloc]                                   initWithTitle:@"Are you sure?"                                   delegate:self                                  cancelButtonTitle:@"No way!"                                  destructiveButtonTitle:@"Yes,I'm sure!"                                  otherButtonTitles:nil, nil];    [actionSheet showInView:self.view];    [actionSheet release];}- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{    if (buttonIndex != [actionSheet cancelButtonIndex]) {        NSString *msg = nil;        if (nameField.text.length > 0) {            msg = [[NSString alloc] initWithFormat:@"You can breathe easy, %@, everything went OK.", nameField.text];        }else{            msg = @"You can breathe easy, everything went Ok.";        }        UIAlertView *alert = [[UIAlertView alloc]                               initWithTitle:@"Something was done"                               message:msg                               delegate:self                               cancelButtonTitle:@"Phew!"                               otherButtonTitles:nil, nil];        [alert show];        [alert release];        [msg release];    }    }- (IBAction)textFieldDoneEditing:(id)sender{    [sender resignFirstResponder];  //Hidden keyboard}- (IBAction)backgroundTap:(id)sender{    [nameField resignFirstResponder];    [passField resignFirstResponder];}- (IBAction)sliderChanged:(id)sender{    UISlider *slider = (UISlider *)sender;    int progress = (int)slider.value;    NSString *labelText = [[NSString alloc] initWithFormat:@"%d",progress];    sliderLabel.text = labelText;    [labelText release];}#pragma mark - View lifecycle- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.}- (void)viewDidUnload{    self.nameField = nil;    self.passField = nil;    self.sliderLabel = nil;    self.leftSwitch = nil;    self.rightSwitch = nil;    self.doSomethingBtn = nil;    [super viewDidUnload];    // Release any retained subviews of the main view.    // e.g. self.myOutlet = nil;}- (void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];}- (void)viewDidAppear:(BOOL)animated{    [super viewDidAppear:animated];}- (void)viewWillDisappear:(BOOL)animated{[super viewWillDisappear:animated];}- (void)viewDidDisappear:(BOOL)animated{[super viewDidDisappear:animated];}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    // Return YES for supported orientations    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);    } else {        return YES;    }}- (void) dealloc{    [nameField release];    [passField release];    [sliderLabel release];    [leftSwitch release];    [rightSwitch release];    [doSomethingBtn release];    [super dealloc];}@end

- (IBAction)toggleControls:(id)sender 当ToggleButton按钮按下时，另外一个按钮设置为同样的状态。
- (IBAction)switchChanged:(id)sender 该事件处理Switch按钮事件，隐藏toggle按钮。
- (IBAction)buttonPressed:(id)sender 当toggle隐藏button显示时，响应Button事件。
- (IBAction)textFieldDoneEditing:(id)sender; 隐藏输入面板，当用户按下输入法Done按钮时

- (IBAction)backgroundTap:(id)sender 隐藏输入法，但用户点击程序任意位置时
- (IBAction)sliderChanged:(id)sender; 当Slider值改变时，Label的text设置为Slider的Value。

到此我们对一些常用的小控件有了一定的了解，接下来我们将学习TableView控件，相当于android平台的ListView控件。

好了就写这么多，有什么问题请留言，大家一起学习交流！

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