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2011年3月24日星期四

iPhone代码片段

1. stringWithFormat 用法:

     [NSString stringWithFormat:@"Hight: %d°%@   Low: %d°%@", [Temp],@"C",[lTemp],@"C"];

       NSString to NSData:
NSString* str= @"kilonet";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];

     2. NSDate 用法:
         NSDate  *today;
    NSDate *tomorrow;
    today 
= [NSDate date];
    tomorrow 
= [NSDate dateWithTimeInterval:(i*24*60*60) sinceDate:today]; //可能有更好的

         Date format用法:
  -(NSString *) getDay:(NSDate *) d {
    NSString *s ;
    NSDateFormatter 
*format = [[NSDateFormatter alloc] init];
    [format setDateFormat:
@"YYYY/MM/dd hh:mm:ss"];
    s 
= [format stringFromDate:d];
    [format release];
    
return s;
}

    各地时区获取:
代码
    NSDate *nowDate = [NSDate new];
    NSDateFormatter 
*formatter    =  [[NSDateFormatter alloc] init];
    [formatter    setDateFormat:
@"yyyy/MM/dd HH:mm:ss"];
    
//    根据时区名字获取当前时间,如果该时区不存在,默认获取系统当前时区的时间
    
//    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Europe/Andorra"];   
    
//    [formatter setTimeZone:timeZone];
    
//获取所有的时区名字
    NSArray *array = [NSTimeZone knownTimeZoneNames];
    
//    NSLog(@"array:%@",array);
    
//for循环
    
//    for(int i=0;i<[array count];i++)
    
//    {
    
//        NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:[array objectAtIndex:i]];
    
//        [formatter setTimeZone:timeZone];
    
//        NSString *locationTime = [formatter stringFromDate:nowDate];
    
//        NSLog(@"时区名字:%@   : 时区当前时间: %@",[array objectAtIndex:i],locationTime);
    
//        //NSLog(@"timezone name is:%@",[array objectAtIndex:i]);
    
//    }   
    
//快速枚举法
    for(NSString *timeZoneName in array){
        [formatter setTimeZone:[NSTimeZone timeZoneWithName:timeZoneName]];
        NSLog(
@"%@,%@",timeZoneName,[formatter stringFromDate:nowDate]);
    }
   
    [formatter release];
    [nowDate release];

     获取毫秒时间:
代码
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
    
//[dateFormatter setDateFormat:@"hh:mm:ss"]
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
    NSLog(
@"Date%@", [dateFormatter stringFromDate:[NSDate date]]);
    [dateFormatter release];


    
      3. NSCalendar用法:
 -(NSString *) getWeek:(NSDate *) d {
   
    NSCalendar 
*calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    unsigned units 
= NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit | NSWeekdayCalendarUnit;
    NSDateComponents 
*components = [calendar components:units fromDate:d];
    [calendar release];
   
    
switch ([components weekday]) {
        
case 2:
            
return @"Monday";
            
break;
        
case 3:
            
return @"Tuesday";
            
break;
        
case 4:
            
return @"Wednesday";
            
break;
        
case 5:
           
return @"Thursday";
            
break;
        
case 6:
            
return  @"Friday";
            
break;
        
case 7:
            
return  @"Saturday";
            
break;
        
case 1:
            
return @"Sunday";
            
break;
        
default:
            
return @"No Week";
            
break;
    }

    
// 用components,我们可以读取其他更多的数据。
   
}

      4. 用Get方式读取网络数据:
// 将网络数读取为字符串
- (NSString *) getDataByURL:(NSString *) url {
    
return [[NSString alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]] encoding:NSUTF8StringEncoding];
}
//读取网络图片
- (UIImage *) getImageByURL:(NSString *) url {
    
return [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]];
}


     5. 多线程NSThread用法 :
[NSThread detachNewThreadSelector:@selector(scheduleTask) toTarget:self withObject:nil];

-(void) scheduleTask {
    
//create a pool 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    
//release the pool;
    [pool release];
}
//如果有参数,则这么使用:
[NSThread detachNewThreadSelector:@selector(scheduleTask:) toTarget:self withObject:[NSDate date]];

-(void) scheduleTask:(NSDate *) mdate {
    
//create a pool 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    
//release the pool;
    [pool release];
}
//注意selector里有冒号。
    //在线程里运行主线程里的方法 
    [self performSelectorOnMainThread:@selector(moveToMain) withObject:nil waitUntilDone:FALSE];


      6. 定时器NSTimer用法:
代码
  // 一个可以自动关闭的Alert窗口

    UIAlertView 
*alert = [[UIAlertView alloc] initWithTitle:nil
                                                    message:[
@"一个可以自动关闭的Alert窗口"
                                                   
delegate:nil
                                          cancelButtonTitle:nil 
//NSLocalizedString(@"OK", @"OK")   //取消任何按钮
                                          otherButtonTitles:nil];
    
//[alert setBounds:CGRectMake(alert.bounds.origin.x, alert.bounds.origin.y, alert.bounds.size.width, alert.bounds.size.height+30.0)];
    [alert show];
   
    UIActivityIndicatorView 
*indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
   
    
// Adjust the indicator so it is up a few pixels from the bottom of the alert    
    indicator.center = CGPointMake(alert.bounds.size.width/2,  alert.bounds.size.height-40.0);
    [indicator startAnimating];
    [alert insertSubview:indicator atIndex:
0];
    [indicator release];
   
    [NSTimer scheduledTimerWithTimeInterval:
3.0f
                                     target:self
                                   selector:@selector(dismissAlert:)
                                   userInfo:[NSDictionary dictionaryWithObjectsAndKeys:alert, 
@"alert"@"testing "@"key" ,nil]  //如果不用传递参数,那么可以将此项设置为nil.
                                    repeats:NO];

    NSLog(
@"release alert");
    [alert release];

-(void) dismissAlert:(NSTimer *)timer{
   
    NSLog(
@"release timer");
    NSLog([[timer userInfo]  objectForKey:
@"key"]);
   
    UIAlertView 
*alert = [[timer userInfo]  objectForKey:@"alert"];
    [alert dismissWithClickedButtonIndex:
0 animated:YES];
  
}

       定时器停止使用:
        [timer invalidate];
        timer 
= nil;



     7. 用户缺省值NSUserDefaults读取:
    //得到用户缺省值
    NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];
   
    
//在缺省值中找到AppleLanguages, 返回值是一个数组
    NSArray* languages = [defs objectForKey:@"AppleLanguages"];
    NSLog(
@"all language语言 is %@", languages);
   
    
//在得到的数组中的第一个项就是用户的首选语言了
    NSLog(@"首选语言 is %@",[languages objectAtIndex:0]); 



    
//get the language & country code
    NSLocale *currentLocale = [NSLocale currentLocale];
   
    NSLog(
@"Language Code is %@", [currentLocale objectForKey:NSLocaleLanguageCode]);   
    NSLog(
@"Country Code is %@", [currentLocale objectForKey:NSLocaleCountryCode]);    


     8. View之间切换的动态效果设置:
    SettingsController *settings = [[SettingsController alloc]initWithNibName:@"SettingsView" bundle:nil];
    settings.modalTransitionStyle 
= UIModalTransitionStyleFlipHorizontal;  //水平翻转
    [self presentModalViewController:settings animated:YES];
    [settings release];


     9.NSScrollView 滑动用法:
-(void) scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(
@"正在滑动中...");
}
//用户直接滑动NSScrollView,可以看到滑动条
-(void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView {

}
// 通过其他控件触发NSScrollView滑动,看不到滑动条
- (void) scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {

}

  
    10. 读取全局的Delegate:
KiloNetAppDelegate *appdelegate = (KiloNetAppDelegate *)[[UIApplication sharedApplication] delegate];

     11.键盘处理系列
 //set the UIKeyboard to switch to a different text field when you press return

//switch textField to the name of your textfield
[textField becomeFirstResponder];

     12. 半透明层的实现:
半透明层
+(void)showWaiting:(UIView *)parent {
    
int width = 32, height = 32;
   
    CGRect frame 
= [parent frame]; //[[UIScreen mainScreen] applicationFrame];
    int x = frame.size.width;
    
int y = frame.size.height;
   
    frame 
= CGRectMake((x - width) / 2, (y - height) / 2, width, height);
    UIActivityIndicatorView
* progressInd = [[UIActivityIndicatorView alloc] initWithFrame:frame];
    [progressInd startAnimating];
    progressInd.activityIndicatorViewStyle 
= UIActivityIndicatorViewStyleWhiteLarge;
   
    
//    frame = CGRectMake((x - 140)/2, (y - height) / 2 + height, 140, 30);//    UILabel *waitingLable = [[UILabel alloc] initWithFrame:frame];//    waitingLable.text = @"Proccesing...";//    waitingLable.textColor = [UIColor whiteColor];//    waitingLable.font = [UIFont systemFontOfSize:15];//    waitingLable.backgroundColor = [UIColor clearColor];
   
    frame 
= [parent frame];
    UIView 
*theView = [[UIView alloc] initWithFrame:frame];
    theView.backgroundColor 
= [UIColor blackColor];
    theView.alpha 
= 0.8;
   
    [theView addSubview:progressInd];
//  [theView addSubview:waitingLable];
   
    [progressInd release];
//    [waitingLable release];
   
    [theView setTag:
9999];
    [parent addSubview:theView];
    [theView release];
}
+(void)hideWaiting:(UIView *)parent {
    [[parent viewWithTag:
9999] removeFromSuperview];
}

      13. 设置View的圆角:
 // 首先应用  #import <QuartzCore/QuartzCore.h>
view.layer.cornerRadius = 10;
view.layer.masksToBounds 
= YES;

      14. UIWebView显示本地图片(目前有点问题,无法正确显示图片):
代码
    NSString *imagePath = [[NSBundle mainBundle] resourcePath];
    imagePath 
= [imagePath stringByReplacingOccurrencesOfString:@"/" withString:@"//"];
    imagePath 
= [imagePath stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
   
    NSLog(
@"fileurl=%@",[NSString stringWithFormat:@"file:/%@//",imagePath]);
   
    
//[self loadData:[html dataUsingEncoding:NSUTF8StringEncoding] MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:[NSURL fileURLWithPath:[NSString stringWithFormat:@"file:/%@//",imagePath]] ];
    [self loadHTMLString:html baseURL:[NSURL fileURLWithPath:[NSString stringWithFormat:@"file:/%@//",imagePath]   ]];
     NSString *path = [[NSBundle mainBundle] bundlePath];
    NSURL *baseURL = [NSURL fileURLWithPath:path];
    [UIWebView loadHTMLString:html baseURL:baseURL];
    
//这段代码可以正确显示图片。


1. 随机数:
srandom(time(NULL)); //随机数种子

id d 
= random(); // 随机数

  2. 视频播放:
    MPMoviePlayerController *moviePlayer;
    moviePlayer 
= [[MPMoviePlayerController alloc]
                   initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:
@"Movie" ofType:@"m4v"]]];
    
//初始化视频播放器对象,并传入被播放文件的地址
    moviePlayer.movieControlMode = MPMovieControlModeDefault;
    [moviePlayer play];
    
//此处有内存溢出

   3.  启动界面显示:
iPhone软件启动后的第一屏图片是非常重要的往往就是loading载入中的意思。设置它说来也简单,但是却无比重要
只需要在resource里面将你希望设置的图片更名为Default.png,这个图片就可以成为iPhone载入的缺省图片

    4. iPhone的系统目录:
//得到Document目录:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString 
*documentsDirectory = [paths objectAtIndex:0];
//得到temp临时目录:
NSString *tempPath = NSTemporaryDirectory();
//得到目录上的文件地址:
NSString *文件地址 = [目录地址 stringByAppendingPathComponent:@"文件名.扩展名"];

    5. 状态栏显示Indicator:

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 

  6.app Icon显示数字:

- (void)applicationDidEnterBackground:(UIApplication *)application{
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:
5];
}

   7.sqlite保存地址:

代码
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString 
*thePath = [paths objectAtIndex:0];
    NSString 
*filePath = [thePath stringByAppendingPathComponent:@"kilonet1.sqlite"];
   
    NSString 
*dbPath = [[[NSBundle mainBundle] resourcePath]
                        stringByAppendingPathComponent:
@"kilonet2.sqlite"];  

   8.Application退出:exit(0);

      9. AlertView,ActionSheet的cancelButton点击事件:
代码
-(void) actionSheet :(UIActionSheet *) actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex {
    NSLog(
@"cancel actionSheet........");
    
//当用户按下cancel按钮
    if( buttonIndex == [actionSheet cancelButtonIndex]) {
        exit(
0);
    }
//    //当用户按下destructive按钮//    if( buttonIndex == [actionSheet destructiveButtonIndex]) {//        // DoSomething here.//    }
}
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
     NSLog(
@"cancel alertView........");
    
if (buttonIndex == [alertView cancelButtonIndex]) {
        exit(
0);
    }
}

    10.给Window设置全局的背景图片:
window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"coolblack.png"]];

    11. UITextField文本框显示及对键盘的控制:
iPhone代码片段收集 - yueding920 - 王凯锋的博客代码
#pragma mark -
#pragma mark UITextFieldDelegate 
//控制键盘跳转
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
  
    
if (textField == _txtAccount) {
        
if ([_txtAccount.text length]==0) {
            
return NO;
        }
        [_txtPassword becomeFirstResponder];
    } 
else if (textField == _txtPassword) {
        [_txtPassword resignFirstResponder];
    }
   
    
return YES;
}
//输入框背景更换
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField{
   
    [textField setBackground:[UIImage imageNamed:
@"ctext_field_02.png"]];
   
    
return YES;
}
-(void) textFieldDidEndEditing:(UITextField *)textField{
    [textField setBackground:[UIImage imageNamed:
@"ctext_field_01.png"]];
}

    12.UITextField文本框前面空白宽度设置以及后面组合按钮设置:
代码
    //给文本输入框后面加入空白
    _txtAccount.rightView = _btnDropDown;
    _txtAccount.rightViewMode 
=  UITextFieldViewModeAlways;
   
    
//给文本输入框前面加入空白
    CGRect frame = [_txtAccount frame];
    frame.size.width 
= 5;
    UIView 
*leftview = [[UIView alloc] initWithFrame:frame];
    _txtAccount.leftViewMode 
= UITextFieldViewModeAlways;
    _txtAccount.leftView 
= leftview;

    13. UIScrollView 设置滑动不超出本身范围:
 [fcScrollView setBounces:NO];
     14. 遍历View里面所有的Subview:
iPhone代码片段收集 - yueding920 - 王凯锋的博客代码
    NSLog(@"subviews count=%d",[self.view.subviews count]);
    
if ([self.view.subviews count] > 0) {
        
for (UIView *curView in self.view.subviews) {
                       NSLog(@
"view.subviews=%@", [NSString stringWithUTF8String:object_getClassName(curView)]);
        }
    }

    14. 在drawRect里画文字:
     UIFont * f = [UIFont systemFontOfSize:20]; 
    [[UIColor darkGrayColor] set]; 
    NSString * text = @"hi \nKiloNet"
    [text drawAtPoint:CGPointMake(center.x,center.y) withFont:f];

    15. NSArray查找是否存在对象时用indexOfObject,如果不存在则返回为NSNotFound.

     16. NString与NSArray之间相互转换:
array = [string componentsSeparatedByString:@","];string = [[array valueForKey:@"description"] componentsJoinedByString:@","];

     17. TabController随意切换tab bar:
[self.tabBarController setSelectedIndex:tabIndex];
或者 self.tabBarController.selectedIndex = tabIndex;
或者实现下面的delegate来扑捉tab bar的事件:
代码
-(BOOL) tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {          if ([viewController.tabBarItem.title isEqualToString: NSLocalizedString(@"Logout",nil)]) {         [self showLogout];         return NO;     }     return YES; }
    18. 自定义View之间切换动画:
代码
- (void) pushController: (UIViewController*) controller
         withTransition: (UIViewAnimationTransition) transition
{
    [UIView beginAnimations:nil context:NULL];
    [self pushViewController:controller animated:NO];
    [UIView setAnimationDuration:.
5];
    [UIView setAnimationBeginsFromCurrentState:YES];       
    [UIView setAnimationTransition:transition forView:self.view cache:YES];
    [UIView commitAnimations];
}
    或者:
代码
CATransition *transition = [CATransition animation];
transition.duration 
= kAnimationDuration;
transition.timingFunction 
= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type 
= kCATransitionPush;
transition.subtype 
= kCATransitionFromTop;
transitioning 
= YES;
transition.
delegate = self;
[self.navigationController.view.layer addAnimation:transition forKey:nil];
   
self.navigationController.navigationBarHidden 
= NO;
[self.navigationController pushViewController:tableViewController animated:YES];

      19. UIWebView加载时白色显示问题解决以及字体统一设置:
    uiWebView.opaque = NO;
 代码

     20.计算字符串长度:
CGFloat w = [title sizeWithFont:[UIFont fontWithName:@"Arial" size:18]].width;

    21. iTunesLink should be your applications link
NSString *iTunesLink = @"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=xxxxxx&mt=8";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];

    22.时间转换NSString & NSDate:
 -(NSDate *)NSStringDateToNSDate:(NSString *)string {    
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
    [formatter setDateFormat:@"yyyy-MM-dd"];
    NSDate *date = [formatter dateFromString:string];
    [formatter release];
    return date;
}
 NSString *year = [myDate descriptionWithCalendarFormat:@"%Y" timeZone:nil locale:nil];
or
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy"];
//Optionally for time zone converstions
[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"..."]];
NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];
 22。 模拟器的文件位置
其中#username#表示当前用户名:
/Users/#username#/Library/Application Support/iPhone Simulator/User/Applications/

  23.在使用UISearchBar时,将背景色设定为clearColor,或者将translucent设为YES,都不能使背景透明,经过一番研究,发现了一种超级简单和实用的方法:
1
[[searchbar.subviews objectAtIndex:0]removeFromSuperview];
背景完全消除了,只剩下搜索框本身了。

   24.  图像与缓存 :
UIImageView *wallpaper = [[UIImageView alloc] initWithImage:        [UIImage imageNamed:@"icon.png"]]; // 会缓存图片

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:        [UIImage imageWithContentsOfFile:@"icon.png"]]; // 不会缓存图片 

  25. iphone-常用的对视图图层(layer)的操作

对图层的操作:

(1.给图层添加背景图片:
myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;

(2.将图层的边框设置为圆脚
myWebView.layer.cornerRadius = 8;
myWebView.layer.masksToBounds = YES;

(3.给图层添加一个有色边框
myWebView.layer.borderWidth = 5;
myWebView.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];

 26. UIPopoverController 使用

-(void) onSetting:(id) sender {

    SplitBaseController *detail = [[SettingServerController alloc] init];

    
    CGRect frame = [(UIView *)sender frame];
    frame.origin.y = 0;
    
    UIPopoverController *popwin = [[UIPopoverController alloc] initWithContentViewController:detail];
    [popwin setPopoverContentSize:CGSizeMake(400, 300) animated:YES];
    popwin.delegate = self;
    [popwin presentPopoverFromRect: frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    [detail release];
}

 27.在UINavigationBar中添加左箭头返回按钮

iPhone里面最讨厌的控件之一就是 UINavigationBar了。这个控件样式修改不方便,连添加按钮也特别麻烦。下面的例子是如何手动添加带箭头的按钮:

UINavigationItem *item = [navBar.items objectAtIndex:0];
UINavigationItem *back = [[UINavigationItem alloc] initWithTitle:@"Back"];
NSArray *items = [[NSArray alloc] initWithObjects:back,item,nil];
[navBar setItems:items];

- (BOOL)navigationBar:(UINavigationBar *)navigationBar
shouldPopItem:(UINavigationItem *)item{
//在此处添加点击back按钮之后的操作代码 
return NO;
}

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