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;
}

UITextField align left margin and clear button

you can do it by overriding two methods:

- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
the first one to align the placeholder and the second one for the editable text, so here is the code following your first answer

@implementation MYTextField

- (CGRect)textRectForBounds:(CGRect)bounds {
    CGRect inset = CGRectMake(bounds.origin.x + 10, bounds.origin.y, bounds.size.width - 10, bounds.size.height);
    return inset;
}


- (CGRect)editingRectForBounds:(CGRect)bounds {
    CGRect inset = CGRectMake(bounds.origin.x + 10, bounds.origin.y, bounds.size.width - 10, bounds.size.height);
    return inset;
}



- (CGRect)clearButtonRectForBounds:(CGRect)bounds {
    CGRect inset = CGRectMake(bounds.origin.x + 113, bounds.origin.y, bounds.size.width - 10, bounds.size.height);
    return inset;
}