Get Text Position in TextView

- (CGRect)frameOfTextRange:(NSRange)range inTextView:(UITextView *)textView
{
    UITextPosition *beginning = textView.beginningOfDocument;
    UITextPosition *start = [textView positionFromPosition:beginning offset:range.location];
    UITextPosition *end = [textView positionFromPosition:start offset:range.length];
    UITextRange *textRange = [textView textRangeFromPosition:start toPosition:end]];
    CGRect rect = [textView firstRectForRange:textRange];
    return [textView convertRect:rect fromView:textView.textInputView];
}

Run project with specified localization

Go to the menu Product > Edit Scheme. Then, in your run configuration switch to the Arguments tab and create a new one to be passed on launch. Add 

-AppleLanguages "(Japanese)"

or

-AppleLanguages "(Ja)"

Get UITextView content size in iOS7

- (CGFloat)measureHeightOfUITextView:(UITextView *)textView
{
    if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1)
    {
        // This is the code for iOS 7. contentSize no longer returns the correct value, so
        // we have to calculate it.
        //
        // This is partly borrowed from HPGrowingTextView, but I've replaced the
        // magic fudge factors with the calculated values (having worked out where
        // they came from)

        CGRect frame = textView.bounds;

        // Take account of the padding added around the text.

        UIEdgeInsets textContainerInsets = textView.textContainerInset;
        UIEdgeInsets contentInsets = textView.contentInset;

        CGFloat leftRightPadding = textContainerInsets.left + textContainerInsets.right + textView.textContainer.lineFragmentPadding * 2 + contentInsets.left + contentInsets.right;
        CGFloat topBottomPadding = textContainerInsets.top + textContainerInsets.bottom + contentInsets.top + contentInsets.bottom;

        frame.size.width -= leftRightPadding;
        frame.size.height -= topBottomPadding;

        NSString *textToMeasure = textView.text;
        if ([textToMeasure hasSuffix:@"\n"])
        {
            textToMeasure = [NSString stringWithFormat:@"%@-", textView.text];
        }

        // NSString class method: boundingRectWithSize:options:attributes:context is
        // available only on ios7.0 sdk.

        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineBreakMode:NSLineBreakByWordWrapping];

        NSDictionary *attributes = @{ NSFontAttributeName: textView.font, NSParagraphStyleAttributeName : paragraphStyle };

        CGRect size = [textToMeasure boundingRectWithSize:CGSizeMake(CGRectGetWidth(frame), MAXFLOAT)
                                                  options:NSStringDrawingUsesLineFragmentOrigin
                                               attributes:attributes
                                                  context:nil];

        CGFloat measuredHeight = ceilf(CGRectGetHeight(size) + topBottomPadding);
        return measuredHeight;
    }
    else
    {
        return textView.contentSize.height;
    }
}

Making the iPhone vibrate

There are two seemingly similar functions that take a parameter kSystemSoundID_Vibrate:

1) AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
2) AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

Both the functions vibrate the iPhone. But when you use the first function on devices that don’t support vibration, it plays a beep sound. The second function on the other hand does nothing on unsupported devices. So if you are going to vibrate the device continuously, as a alert, common sense says, use function 2.

Don't forget to add:
#import <AudioToolbox/AudioServices.h>

Keep iPhone from sleeping

To stop your app from timing out and going to sleep you can use:
[UIApplication sharedApplication].idleTimerDisabled = YES;

This will, obviously, disable the idle timer and stop your iphone from automatically going into sleep mode.

Note: To re-enable the idle timer when you no longer need to keep the phone awake (generally after that view has been removed) using:
[UIApplication sharedApplication].idleTimerDisabled = NO;

Open URL in Browser for Windows Phone 8

using System;
using Microsoft.Phone.Tasks;

WebBrowserTask webBrowserTask = new WebBrowserTask();
webBrowserTask.Uri = new Uri("http://msdn.microsoft.com", UriKind.Absolute);
webBrowserTask.Show();

Get Windows Phone Screen Size and Scale Factor

using System.Windows;  
public void GetScreenResolution()  
{  
     double w = Application.Current.Host.Content.ActualWidth;  
     double h = Application.Current.Host.Content.ActualHeight;  
     int scale = Application.Current.Host.Content.ScaleFactor;  
}

The following is an overview of the current characteristics of all these properties:

	WVGA	HD	WXGA
ActualWidth	480	480	480
ActualHeight	800	853	800
ScaleFactor (%)	100	150	160
Resulting Size (Width/Height x Scale)	480x800	720x1280	768x1280

Debug or Print Log in Windows Phone 8

System.Diagnostics.Debug.WriteLine("")

You can debug the native code in the windows phone Runtime Component by selecting the native debug engine for the UI Task. in this case you will also get the debug output.

to select the native debug engine for UI Task

1. Go to debug property page by right clicking on the project and selecting the "properties" menu followed by selecting the "Debug" tab.

2. Under the "UI Task" there is a drop down. select "Native Only"

Dismiss UIAlertViews or UIActionSheet When Enter Background State

- (void)checkViews:(NSArray *)subviews {
    Class AVClass = [UIAlertView class];
    Class ASClass = [UIActionSheet class];
    for (UIView * subview in subviews){
        if ([subview isKindOfClass:AVClass]){
            [(UIAlertView *)subview dismissWithClickedButtonIndex:[(UIAlertView *)subview cancelButtonIndex] animated:NO];
        } else if ([subview isKindOfClass:ASClass]){
            [(UIActionSheet *)subview dismissWithClickedButtonIndex:[(UIActionSheet *)subview cancelButtonIndex] animated:NO];
        } else {
            [self checkViews:subview.subviews];
        }
    }
}

Calling it from the applicationDidEnterBackground procedure

[self checkViews:application.windows];

Eliminate Extra separators below UITableView

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
     // This will create a "invisible" footer
     return 0.01f;
 }

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{        
    return [UIView new];

    // If you are not using ARC:
    // return [[UIView new] autorelease];
}