iPhone常用控件、UIActionSheet、UIAlertView
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];
}
七、UISegmentedControl
#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;
}
}
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>
{
// ....
}
// 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];
}
// 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);
//}
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.m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99100101102103104105106107108109110111112//// UntitledViewController.m// Untitled//// Created by Elf Sundae on 11/10/10.// Copyright 2010 www.cnBlogs.com/ElfSundae. All rights reserved.//#import "UntitledViewController.h"@implementationUntitledViewController@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])
{
casekSegmentIndex_Switches: leftSwitch.hidden = NO;
rightSwitch.hidden = NO;
doSomethingButton.hidden = YES;
break;
casekSegmentIndex_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