Hide Keyboard when tap return in textview

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    
    if([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }
    
    return YES;
}

Tap anywhere to hide Keyboard

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.singleTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapAnywhere:)];
    self.singleTapRecognizer.numberOfTapsRequired = 1;
    self.singleTapRecognizer.cancelsTouchesInView = NO;
}

-(void)didTapAnywhere: (UITapGestureRecognizer*) recognizer {    
    //[textField resignFirstResponder];
    [self.view endEditing:YES];
}

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    NSLog(@"add gesture recg");
    [self.view addGestureRecognizer:singleTapRecognizer];
}
- (void)textViewDidEndEditing:(UITextView *)textView
{
    NSLog(@"remove gesture recg");
    [self.view removeGestureRecognizer:singleTapRecognizer];
}

Stretching an UIImage while preserving the corners

 original image

 result

myImageView.image = [myImageView.image resizableImageWithCapInsets:UIEdgeInsetsMake(20.f, 12.f, 19.f, 19.f)];


For lower iOS version, use 

[UIImage stretchableImageWithLeftCapWidth:15 topCapHeight:13];

Blur Effect

Add QuartzCore Framework
Add this to the beginning of the AppDelegates.h


#import <QuartzCore/QuartzCore.h>

@interface CAFilter : NSObject 
@end

Add this to the didFinishLaunchingWithOptions method (before makeKeyAndVisible call)

CAFilter* filter = [CAFilter filterWithName:@"gaussianBlur"];

[filter setValue:[NSNumber numberWithFloat:5] forKey:@"inputRadius"];

window.layer.filters = [NSArray arrayWithObject:filter];

Other way you can use this in UIView:

- (IBAction)toggleBlur {

    CALayer *layer = [self.blurView layer];

    blur = !blur;

    if (blur) {

        [layer setRasterizationScale:0.3];

        [layer setShouldRasterize:YES];

    } else {

        [layer setRasterizationScale:1.0];

        [layer setShouldRasterize:NO];

    }

}

See the other static filters available at:

http://www.iphonedevwiki.net/index.php?title=CAFilter

Resize UIImage

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

API to get current Address

http://maps.googleapis.com/maps/api/geocode/json?latlng=1.298564,103.853973&sensor=false

UIButton Edge Inset

CGFloat spacing = 10; // the amount of spacing to appear between image and title
tabBtn.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, spacing);
tabBtn.titleEdgeInsets = UIEdgeInsetsMake(0, spacing, 0, 0);

Scroll Tableview to the top

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];

Get Youtube Video ID

+ (NSString*) getVideoID:(NSString*)linkString
{
    NSMutableString *predicateString = [[NSMutableString alloc] initWithFormat:@"%@", linkString];
    
    NSString *regexStr = @"[a-zA-Z0-9_-]{10}";
    
    NSError *error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regexStr
                                                                           options:NSRegularExpressionCaseInsensitive
                                                                             error:&error];
    
    __block NSString *retunString = @"";
    [regex enumerateMatchesInString:predicateString options:0 range:NSMakeRange(0, [predicateString length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop){
        NSRange matchRange = [match range];
        matchRange.length = matchRange.length+1;
        //NSLog(@"matchRange.location: %d",matchRange.location); //31
        //NSLog(@"matchRange.length: %d",matchRange.length); //11
        //NSLog(@"result: %@", [predicateString substringWithRange:matchRange]); //tTfj05VNT40
        retunString = [predicateString substringWithRange:matchRange];
    }];
    
    return retunString;
}

Make a UIImage from a MKMapView or Other View

The improved function for retina display:


- (UIImage*) renderToImage
{
    if(UIGraphicsBeginImageContextWithOptions != NULL)
    {
        UIGraphicsBeginImageContextWithOptions(mapView.frame.size, NO, 0.0);
    } else {
        UIGraphicsBeginImageContext(mapView.frame.size);
    }
    [mapView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext(); 
    return image;
}