2011年2月15日 星期二

iPhone各類Code筆記(未分類)


1. 隨機數:
srandom(time(NULL)); //隨機數種子

id d 
= random(); // 隨機數

  2. 視頻播放:
    MPMoviePlayerController *moviePlayer;
    moviePlayer 
= [[MPMoviePlayerController alloc]
                   initWithContentURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:
@"Movie" ofType:@"m4v"]]];
    
//初始化視頻播放器對象,並傳入被播放文件的地址
    moviePlayer.movieControlMode = MPMovieControlModeDefault;
    [moviePlayer play];
    
//此處有內存溢出

   3.  啟動界面顯示:
iPhone軟件啟動後的第一屏圖片是非常重要的往往就是loading載入中的意思。設置它說來也簡單,但是卻無比重要

只需要在resource裡面將你希望設置的圖片更名為Default.png,這個圖片就可以成為iPhone載入的缺省圖片


    4. iPhone的系統目錄:

//得到Document目錄:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString 
*documentsDirectory = [paths objectAtIndex:0];
//得到temp臨時目錄:
NSString *tempPath = NSTemporaryDirectory();
//得到目錄上的文件地址:
NSString *文件地址 = [目錄地址 stringByAppendingPathComponent:@"文件名.擴展名"];

    5. 狀態欄顯示Indicator:
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 

  6.app Icon顯示數字:

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

   7.sqlite保存地址:




    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點擊事件:
-(void) actionSheet :(UIActionSheet *) actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex {
    NSLog(@"cancel actionSheet........");
    
//當用戶按下cancel按鈕
    if( buttonIndex == [actionSheet cancelButtonIndex]) {
        exit(
0);
    }
//    //當用戶按下destructive按鈕//    if( buttonIndex == [actionSheet destructiveButtonIndex]) {//        // DoSomething here.//    }
}
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex {
     NSLog(
@"cancel alertView........");
    
if (buttonIndex == [alertView cancelButtonIndex]) {
        exit(
0);
    }
}

    10.給Window設置全局的背景圖片:
window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"coolblack.png"]];

    11. UITextField文本框顯示及對鍵盤的控制:
#pragma mark -
#pragma mark UITextFieldDelegate 
//控制鍵盤跳轉
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
 
    
if (textField == _txtAccount) {
        
if ([_txtAccount.text length]==0) {
            
return NO;
        }
        [_txtPassword becomeFirstResponder];
    } 
else if (textField == _txtPassword) {
        [_txtPassword resignFirstResponder];
    }
  
    
return YES;
}
//輸入框背景更換
-(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文本框前面空白寬度設置以及後面組合按鈕設置:
    //給文本輸入框後面加入空白
    _txtAccount.rightView = _btnDropDown;
    _txtAccount.rightViewMode 
=  UITextFieldViewModeAlways;
  
    
//給文本輸入框前面加入空白
    CGRect frame = [_txtAccount frame];
    frame.size.width 
= 5;
    UIView 
*leftview = [[UIView alloc] initWithFrame:frame];
    _txtAccount.leftViewMode 
= UITextFieldViewModeAlways;
    _txtAccount.leftView 
= leftview;

    13. UIScrollView 設置滑動不超出本身范圍:
 [fcScrollView setBounces:NO]; 
     14. 遍歷View裡面所有的Subview:
    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裡畫文字:
     UIFont * f = [UIFont systemFontOfSize:20]; 
    [[UIColor darkGrayColorset]; 
    NSString * text = @"hi \nKiloNet"
    [text drawAtPoint:CGPointMake(center.x,center.ywithFont:f];

    15. NSArray查找是否存在對象時用indexOfObject,如果不存在則返回為NSNotFound.

     16. NString與NSArray之間相互轉換:
array = [string componentsSeparatedByString:@","];string = [[array valueForKey:@"description"] componentsJoinedByString:@","];

     17. TabController隨意切換tab bar:
[self.tabBarController setSelectedIndex:tabIndex];
或者 self.tabBarController.selectedIndex = tabIndex;
或者實現下面的delegate來撲捉tab bar的事件:
-(BOOL) tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {          if ([viewController.tabBarItem.title isEqualToString: NSLocalizedString(@"Logout",nil)]) {         [self showLogout];         return NO;     }     return YES; }
    18. 自定義View之間切換動畫:
- (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:
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加載時白色顯示問題解決以及字體統一設置:
    uiWebView.opaque = NO; 


     20.計算字符串長度:
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.時間轉換NSString & NSDate:
 -(NSDate *)NSStringDateToNSDate:(NSString *)string {    
    NSDateFormatter *formatter = [[NSDateFormatter allocinit];
    [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。 模擬器的文件位置

其中#username#表示當前用戶名:
/Users/#username#/Library/Application Support/iPhone Simulator/User/Applications/


  23.在使用UISearchBar時,將背景色設定為clearColor,或者將translucent設為YES,都不能使背景透明,經過一番研究,發現了一種超級簡單和實用的方法:

1
[[searchbar.subviews objectAtIndex:0]removeFromSuperview];

背景完全消除了,只剩下搜索框本身了。 

   24.  圖像與緩存 :
UIImageView *wallpaper = [[UIImageView alloc] initWithImage:
        [UIImage imageNamed:@"icon.png"]]; // 會緩存圖片

UIImageView *wallpaper = [[UIImageView alloc] initWithImage:
        [UIImage imageWithContentsOfFile:@"icon.png"]]; // 不會緩存圖片 

  25. iphone-常用的對視圖圖層(layer)的操作

對圖層的操作:

(1.給圖層添加背景圖片:
myView.layer.contents = (id)[UIImage imageNamed:@"view_BG.png"].CGImage;

(2.將圖層的邊框設置為圓腳
myWebView.layer.cornerRadius = 8;
myWebView.layer.masksToBounds = YES;

(3.給圖層添加一個有色邊框
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 allocinit];

    
    CGRect frame = [(UIView *)sender frame];
    frame.origin.y = 0;
    
    UIPopoverController *popwin = [[UIPopoverController allocinitWithContentViewController:detail];
    [popwin setPopoverContentSize:CGSizeMake(400300animated:YES];
    popwin.delegate = self;
    [popwin presentPopoverFromRect: frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

    [detail release];
} 

 27.在UINavigationBar中添加左箭頭返回按鈕

iPhone裡面最討厭的控件之一就是 UINavigationBar了。這個控件樣式修改不方便,連添加按鈕也特別麻煩。下面的例子是如何手動添加帶箭頭的按鈕:

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{
//在此處添加點擊back按鈕之後的操作代碼 
return NO;
} 

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