Block Type

Return_Type  (^ Block_Name) (Parameters)

void (^ x) (void)  =   ^{
       NSLog(@"block--without--parameter--without--returntype");
};

    

    

void (^ xx) (int)  =  ^(int a){
        NSLog(@"bloc--with-one-parameter--without--returnType -- %d", a);
};

    

void (^ xxx) (int, NSString *)  =  ^(int a, NSString *s){
        NSLog(@"block--with-two-parameters--without--returnType - %d -- %@", a, s);
};

    

NSString* (^ xxxx) (int, NSString *)  =   ^(int a, NSString *s){

        NSString *ss = [NSString stringWithFormat:@"block--with--parameters--and--returntype %@ - %d", s, a];

        return ss; 

};

Remove UIWebView's key bord top bar.

UIWindow *keyboardWindow = nil;

- (void)removeBar { 

    // Locate UIWebFormView.

    for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) {

        if (![[testWindow class] isEqual:[UIWindow class]]) {

            keyboardWindow = testWindow;

            // Locate UIWebFormView.

            for (UIView *possibleFormView in [keyboardWindow subviews]) {       

                // iOS 5 sticks the UIWebFormView inside a UIPeripheralHostView.

                if ([[possibleFormView description] rangeOfString:@"UIPeripheralHostView"].location != NSNotFound) {

                    for (UIView *subviewWhichIsPossibleFormView in [possibleFormView subviews]) {

                        NSRange range = [[subviewWhichIsPossibleFormView description] rangeOfString:@"UIWebFormAccessory"];

                        if (range.location != NSNotFound) {

                            [subviewWhichIsPossibleFormView removeFromSuperview]; 

                        }

                    }

                }

            } 

        }

    }   

}

UIWebView insert Items

• Insert Image

<img src="imagePath/imageName.png" width ="280px" height = "187px"/><br />

• Insert Link

with Title

<a href='http://www.link.com/' style='color:#fd9600;'>LinkTitle</a>

with Image

<a href='http:///www.link.com'><img src='imagePath/image.jpg' width ='280px' height = '179px'/></a>

Add Views to UIAlertView

1. Create UIAlertView with buttons using UIAlertView initWithTitle methods with buttons.
2. create the views wich you wish and add it to AlertView using addSubView: methods.
3. use below delegate method to organize your views.
     - (void)willPresentAlertView:(UIAlertView *)alertView

// create alertView

-(void)configureAlert{

     alertView = [[UIAlertView alloc] initWithTitle:@"Tittle" message:@"message" delegate:self                                    

cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok",nil];

     textField = [[UITextField alloc] initWithFrame:CGRectMake(12, 86, 262, 28)];

     [textField becomeFirstResponder];
     [textField setPlaceholder:@"Password"];
     [textField setReturnKeyType:UIReturnKeyDone];  

     [textField setInputAccessoryView:customAccView1];
     [textField setFont:[UIFont fontWithName:@"Helvetica Neue" size:18]];
     [textField setContentMode:UIViewContentModeBottom];
     [textField setBackgroundColor:[UIColor whiteColor]];

     // vertical alignment of text in textField

     [textField setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
     [alertView textField];
     [alertView show];
}

- (void)willPresentAlertView:(UIAlertView *)alertView { 

          [alertView setFrame:CGRectMake(17, 30, 286, 188)];

          NSArray *subviewArray = [alertView subviews];

          UILabel *label = (UILabel *)[subviewArray objectAtIndex:2];

          [label setFrame:CGRectMake(10, 46, 260, 20)];

          UIButton *buttonOk = (UIButton *)[subviewArray objectAtIndex:4];

          [buttonOk setFrame:CGRectMake(10, 130, 128, 42)];

           UIButton *buttonCancel = (UIButton *)[subviewArray objectAtIndex:3];

          [buttonCancel setFrame:CGRectMake(148, 130, 128, 42)]; 

}

   
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
     // button actions
}

Transparent UIWebView

To transparent the UIWebView and remove the scrolls.

webView.opaque = NO;
webView.backgroundColor = [UIColor clearColor];
for(UIView *view in webView.subviews){ 

     if ([view isKindOfClass:[UIImageView class]]) {

          // to transparent 

          [view removeFromSuperview];

     }
     if ([view isKindOfClass:[UIScrollView class]]) {
          UIScrollView *sView = (UIScrollView *)view;

          //to hide verticalScroller

          sView.showsVerticalScrollIndicator = NO;

          for (UIView* shadowView in [sView subviews]){

               //to remove shadow

               if ([shadowView isKindOfClass:[UIImageView class]]) {

                    [shadowView setHidden:YES];

               }

          }

     }
}

From NSData to CFDataRef

NSData *imageData = UIImagePNGRepresentation(originalImage);
CFDataRef cfdata = CFDataCreate(NULL, [imageData bytes], [imageData length]);

Objective C date comparision

if (licenseDictionary == nil){

     return @"Not Registered"; 

}else if([today compare:expDate] == NSOrderedAscending) {

     [gotoButton setEnabled:YES]; return [licenseDictionary objectForKey:@"Name"]; 

} else{

     return @"License Expired";

}

How multitasking works on iPhone

Here is an interesting article about how multitasking works on iPhone

http://gizmodo.com/5512656/how-multitasking-works-in-the-new-iphone-os-40