Successful iOS Background Location reporting

http://www.mindsizzlers.com/2011/07/ios-background-location/

Backgrond Task in Ios

http://mobile.tutsplus.com/tutorials/iphone/ios-multitasking-background-tasks/

How to Play, Record, and Edit Videos in iOS

http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios

Crop images iphone sdk

Crop images iphone sdk

http://www.ardalahmet.com/2011/10/17/ssphotocropperviewcontroller-a-custom-viewcontroller-that-provides-ui-for-cropping-photos-in-ios-apps/

How to style UITextview to like Rounded Rect text field?

[yourTextView.layer setBackgroundColor: [[UIColor whiteColor] CGColor]];
    [yourTextView.layer setBorderColor: [[UIColor grayColor] CGColor]];
    [yourTextView.layer setBorderWidth: 1.0];
    [yourTextView.layer setCornerRadius:8.0f];
    [yourTextView.layer setMasksToBounds:YES];

iPhone how to check that a string is numeric only

static bool TextIsValidValue( NSString* newText, double &value )
{
    bool result = false;

    if ( [newText isMatchedByRegex:@"^(?:|0|[1-9]\\d*)(?:\\.\\d*)?$"] ) {
        result = true;
        value = [newText doubleValue];
    }
    return result;
}

- (IBAction) doTextChanged:(id)sender;
{
    double value;
    if ( TextIsValidValue( [i_pause stringValue], value ) ) {
        [i_pause setTextColor:[NSColor blackColor]];
        // do something with the value
    } else {
        [i_pause setTextColor:[NSColor redColor]];
    }
}

Detecting direction of a swipe

Detecting direction of a swipe

MainView.h
Code:

#import
#import

@interface MainView : UIView {
IBOutlet UILabel *whataction;
CGPoint gestureStartPoint;
}

@end

MainView.m
Code:

#import "MainView.h"

@implementation MainView

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
gestureStartPoint = [touch locationInView:self];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self];
if (currentPosition.x - 30 > gestureStartPoint.x) {
[whataction setText:@"FAR RIGHT"];
}
else if (currentPosition.x > gestureStartPoint.x) {
[whataction setText:@"RIGHT"];
}
if (currentPosition.x + 30 < gestureStartPoint.x) {
[whataction setText:@"FAR LEFT"];
}
else if (currentPosition.x < gestureStartPoint.x) {
[whataction setText:@"LEFT"];
}
if (currentPosition.y - 30 > gestureStartPoint.y) {
[whataction setText:@"FAR DOWN"];
}
else if (currentPosition.y > gestureStartPoint.y) {
[whataction setText:@"DOWN"];
}
if (currentPosition.y + 30 < gestureStartPoint.y) {
[whataction setText:@"FAR UP"];
}
else if (currentPosition.y < gestureStartPoint.y) {
[whataction setText:@"UP"];
}
}
@end