iPhone SDK Basic Controllers

最新推荐文章于 2025-09-09 15:05:27 发布

原创最新推荐文章于 2025-09-09 15:05:27 发布 · 441 阅读

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本文介绍了一系列iOS应用中的UI交互实现方式，包括键盘管理、滑块数值显示、开关状态切换、分段控制器操作、警告框使用及按钮美化等。通过具体代码示例展示了不同组件的功能和用途。

1, When you edit with keyboard on ,click the background the keyboard will disappear

- (IBAction)backgroundClick:(id)sender { [nameField resignFirstResponder]; [numberField resignFirstResponder]; }

2, slider's value display by a label

- (IBAction)sliderChanged:(id)sender { UISlider *slider = (UISlider *)sender; int progressAsInt = (int)(slider.value + 0.5f); NSString *newText = [[NSString alloc] initWithFormat:@"%d", progressAsInt]; sliderLabel.text = newText; [newText release]; }

3,Use Switch //value changed function

- (IBAction)switchChanged:(id)sender { UISwitch *whichSwitch = (UISwitch *)sender; BOOL setting = whichSwitch.isOn; [rightSwitch setOn:setting animated:YES]; }

4,Using Segmented Controller

- (IBAction)toggleShowHide:(id)sender { UISegmentedControl *segmentedControl = (UISegmentedControl *)sender; NSInteger segment = segmentedControl.selectedSegmentIndex; if (segment == kShowSegmentIndex) [switchView setHidden:NO]; else [switchView setHidden:YES]; }

5,USing Operation Table and Alert

- (IBAction)doSomething:(id)sender { UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Are you sure?" delegate:self cancelButtonTitle:@"No Way!" destructiveButtonTitle:@"Yes, I'm Sure!" otherButtonTitles: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:@"breathe easy, %@, OK.",nameField.text]; else msg = @"breathe easy, OK."; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Something was done" message:msg delegate:self cancelButtonTitle:@"Phew!" otherButtonTitles:nil]; [alert show]; [alert release]; [msg release]; } }

6,Using beauty button

- (void)viewDidLoad { UIImage *buttonImageNormal = [UIImage imageNamed:@"whiteButton.png"]; UIImage *stretchableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0]; [doSomethingButton setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal]; UIImage *buttonImagePressed = [UIImage imageNamed:@"blueButton.png"]; UIImage *stretchableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0]; [doSomethingButton setBackgroundImage:stretchableButtonImagePressed forState:UIControlStateHighlighted]; }