Iphone 开发常用代码
来源:互联网 发布:java集合类实现类 编辑:程序博客网 时间:2024/05/24 04:44
更改cell选中的背景
[self.viewaddSubview:testDrag];
UIView *myview =[UIView alloc] init];
myview.frame = CGRectMake(0,0,320, 47);
myview.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"0006.png"];
cell.selectedBackgroundView = myview;
在数字键盘上添加button:
//定义一个消息中心
[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotificationobject:nil];//addObserver:注册一个观察员 name:消息名称
- (void)keyboardWillShow:(NSNotification *)note {
// create custom button
UIButton *doneButton = [UIButtonbuttonWithType:UIButtonTypeCustom];
doneButton.frame =CGRectMake(0,163,106, 53);
[doneButtonsetImage:[UIImageimageNamed:@"5.png"]forState:UIControlStateNormal];
[doneButtonaddTarget:selfaction:@selector(addRadixPoint)forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
UIWindow* tempWindow = [[UIApplicationsharedApplication]windows]objectAtIndex:1];//返回应用程序window
UIView* keyboard;
for(int i=0; i<[tempWindow.subviewscount]; i++)//遍历window上的所有subview
{
keyboard = [tempWindow.subviewsobjectAtIndex:i];
// keyboard view found; add the custom button to it
if([keyboard description] hasPrefix:@"<UIKeyboard"] == YES)
[keyboard addSubview:doneButton];
}
}
正则表达式使用:
被用于正则表达式的字串必须是可变长的,不然会出问题
将一个空间放在视图之上
[scrollView insertSubview:searchButton aboveSubview:scrollView];
从本地加载图片
NSString *boundle = [NSBundlemainBundle]resourcePath];
[web1 loadHTMLString:[NSString stringWithFormat:@"<img src='0001.png'/>"] baseURL:[NSURL fileURLWithPath:boundle];
从网页加载图片并让图片在规定长宽中缩小
[cell.img loadHTMLString:[NSString stringWithFormat:@"<html><body><img src='%@' height='90px' width='90px'></body> </html>", goodsInfo.GoodsImg] baseURL:nil];
将网页加载到webview上通过javascript获取里面的数据,如果只是发送了一个连接请求获取到源码以后可以用正则表达式进行获取数据
NSString *javaScript1 =@"document.getElementsByName('.u').item(0).value";
NSString *javaScript2 =@"document.getElementsByName('.challenge').item(0).value";
NSString *strResult1 = [NSString stringWithString:[theWebView stringByEvaluatingJavaScriptFromString:javaScript1];
NSString *strResult2 = [NSString stringWithString:[theWebView stringByEvaluatingJavaScriptFromString:javaScript2];
用NSString怎么把UTF8转换成unicode
utf8Str //
NSString *unicodeStr = [NSString stringWithCString:[utf8Str UTF8String] encoding:NSUnicodeStringEncoding];
View自己调用自己的方法:
[selfperformSelector:@selector(loginToNext)withObject:nilafterDelay:2];
//loginToNext为方法名,和延迟几秒执行.显示图像:
CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);
UIImageView *myImage = [UIImageViewalloc]initWithFrame:myImageRect];
[myImage setImage:[UIImage imageNamed:@"myImage.png"];
myImage.opaque = YES; //opaque是否透明
[self.view addSubview:myImage];
[myImage release];
WebView:
CGRect webFrame = CGRectMake(0.0, 0.0, 320.0, 460.0);
UIWebView *webView = [UIWebViewalloc]initWithFrame:webFrame];
[webView setBackgroundColor:[UIColor whiteColor];
NSString *urlAddress =@"http://www.google.com";
NSURL *url = [NSURLURLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequestrequestWithURL:url];
[webView loadRequest:requestObj];
[self addSubview:webView];
[webView release];
这是在iPhone左上部的状态栏显示的转动的图标指示有背景发生网络的活动。
UIApplication* app = [UIApplicationsharedApplication];
app.networkActivityIndicatorVisible =YES;
动画:一个接一个地显示一系列的图象
NSArray *myImages = [NSArrayarrayWithObjects: [UIImageimageNamed:@"myImage1.png"],
[UIImageimageNamed:@"myImage2.png"],
[UIImage imageNamed:@"myImage3.png"],
[UIImage imageNamed:@"myImage4.gif"],nil];
UIImageView *myAnimatedView = [UIImageViewalloc];
[myAnimatedView initWithFrame:[self bounds];
myAnimatedView.animationImages = myImages;//animationImages属性返回一个存放动画图片的数组
myAnimatedView.animationDuration = 0.25; //浏览整个图片一次所用的时间
myAnimatedView.animationRepeatCount =0;// 0 = loops forever动画重复次数
[myAnimatedView startAnimating];
[self addSubview:myAnimatedView];
[myAnimatedView release];
动画:显示了something在屏幕上移动。注:这种类型的动画是“开始后不处理” -你不能获取任何有关物体在动画中的信息(如当前的位置) 。如果您需要此信息,您会手动使用定时器去调整动画的X和Y坐标
这个需要导入QuartzCore.framework
CABasicAnimation *theAnimation;
theAnimation=[CABasicAnimationanimationWithKeyPath:@"transform.translation.x"];
//Creates and returns an CAPropertyAnimation instance for the specified key path.
//parameter:the key path of the property to be animated
theAnimation.duration=1;
theAnimation.repeatCount=2;
theAnimation.autoreverses=YES;
theAnimation.fromValue=[NSNumbernumberWithFloat:0];
theAnimation.toValue=[NSNumbernumberWithFloat:-60];
[view.layeraddAnimation:theAnimationforKey:@"animateLayer"];
Draggable items//拖动项目
Here's how to create a simple draggable image.//这是如何生成一个简单的拖动图象
1. Create a new class that inherits from UIImageView
@interface myDraggableImage : UIImageView { }
2. In the implementation for this new class, add the 2 methods:- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// Retrieve the touch point检索接触点
CGPoint pt = [[touchesanyObject] locationInView:self];
startLocation = pt;
[[selfsuperview]bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
// Move relative to the original touch point相对以前的触摸点进行移动
CGPoint pt = [[touchesanyObject] locationInView:self];
CGRect frame = [self frame];
frame.origin.x += pt.x - startLocation.x;
frame.origin.y += pt.y - startLocation.y;
[self setFrame:frame];
}
3. Now instantiate the new class as you would any other new image and add it to your view
//实例这个新的类,放到你需要新的图片放到你的视图上
dragger = [myDraggableImage alloc] initWithFrame:myDragRect];
[dragger setImage:[UIImage imageNamed:@"myImage.png"];
[dragger setUserInteractionEnabled:YES];
最后不要忘了[self.viewaddSubview:testDrag];
1. Create the new thread:
[NSThread detachNewThreadSelector:@selector(myMethod) toTarget:self withObject:nil];
2. Create the method that is called by the new thread:- (void)myMethod
{
NSAutoreleasePool *pool = [NSAutoreleasePool alloc] init];
*** code that should be run in the new thread goes here ***
[pool release];
}
//What if you need to do something to the main thread from inside your new thread (for example, show a loading //symbol)? Use performSelectorOnMainThread.[self performSelectorOnMainThread:@selector(myMethod) withObject:nil waitUntilDone:false];
Plist files
Application-specific plist files can be stored in the Resources folder of the app bundle. When the app first launches, it should check if there is an existing plist in the user's Documents folder, and if not it should copy the plist from the app bundle.
// Look in Documents for an existing plist file
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectory = [pathsobjectAtIndex:0];
myPlistPath = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: @"%@.plist", plistName]];
[myPlistPath retain];
// If it's not there, copy it from the bundleNSFileManager *fileManger = [NSFileManagerdefaultManager];
if ( ![fileManger fileExistsAtPath:myPlistPath] )
{
NSString *pathToSettingsInBundle = [NSBundle mainBundle] pathForResource:plistName ofType:@"plist"];
}
//Now read the plist file from DocumentsNSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectoryPath = [pathsobjectAtIndex:0];
NSString *path = [documentsDirectoryPathstringByAppendingPathComponent:@"myApp.plist"];
NSMutableDictionary *plist = [NSDictionarydictionaryWithContentsOfFile:path];
//Now read and set key/valuesmyKey = (int)[plist valueForKey:@"myKey"] intValue];
myKey2 = (bool)[plist valueForKey:@"myKey2"] boolValue];
[plist setValue:myKey forKey:@"myKey"];
[plist writeToFile:path atomically:YES];
Alerts
Show a simple alert with OK button.
UIAlertView *alert = [UIAlertView alloc] initWithTitle:nil message:
@"An Alert!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
Info button
Increase the touchable area on the Info button, so it's easier to press.
CGRect newInfoButtonRect = CGRectMake(infoButton.frame.origin.x-25, infoButton.frame.origin.y-25, infoButton.frame.size.width+50, infoButton.frame.size.height+50);
[infoButton setFrame:newInfoButtonRect];
Detecting Subviews
You can loop through subviews of an existing view. This works especially well if you use the "tag" property on your views.
for (UIImageView *anImage in [self.view subviews]){
if (anImage.tag == 1)
{ // do something }
}
}
- iPhone开发常用代码
- iphone开发常用代码
- iPhone开发常用代码
- iphone开发常用代码
- Iphone 开发常用代码
- Iphone 开发常用代码
- iphone 开发 常用代码
- iPhone开发常用代码
- Iphone 开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- Iphone 开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- iphone开发常用代码
- java与android 的视频链接
- 浅谈用户名密码登录方式的弊端
- js-crossdomain
- 涉及的概念和技术
- TCPDUMP
- Iphone 开发常用代码
- OBJECT ARX总结6
- erlang的官方文档部分翻译
- Windows错误代码汇总大全
- 全排列的生成
- Web站点必须更新dll
- 为什么DelphiX 退出时总是报内存泄漏?
- 编程基础-面向对象-对象的实现方式(模版/原型)
- OBJECT ARX 实体类 通用操作函数