Utility and Tips for iPhone programming ref: http://qiita.com/items/fcccf652fd51a2f9b010

ColorUtil.m

+(UIColor*) hexToUIColor:(NSString *)hex
{
    if(hex.length == 6)
        hex = [@"FF" stringByAppendingString: hex];
    NSScanner *colorScanner = [NSScanner scannerWithString:hex];
    unsigned int color;
    [colorScanner scanHexInt:&color];
    CGFloat a = ((color & 0xFF000000) >> 24)/255.0f;
    CGFloat r = ((color & 0x00FF0000) >> 16)/255.0f;
    CGFloat g = ((color & 0x0000FF00) >> 8) /255.0f;
    CGFloat b =  (color & 0x000000FF) /255.0f;
    return [UIColor colorWithRed:r green:g blue:b alpha:a];
}

LayoutUtil.m

+(CGFloat)screenWidth
{
    CGRect r = [[UIScreen mainScreen] bounds];
    return r.size.width;
}

+(CGFloat)fullScreenHeight
{
    CGRect r = [[UIScreen mainScreen] bounds];
    return r.size.height;
}

+(CGFloat)screenHeight
{
    CGRect r = [[UIScreen mainScreen] applicationFrame];
    return r.size.height;
}

+(CGFloat)statusBarHeight
{
    CGRect full = [[UIScreen mainScreen] bounds];
    CGRect main = [[UIScreen mainScreen] applicationFrame];
    return full.size.height - main.size.height;
}

+(CGFloat)navigationBarHeight
{
    // Use this method in ViewController >> [[[self tabBarController] rotationgHeaderView] frame].size.height; 
    return 44.0;
}

+(CGFloat)tabBarHeight
{
    // Use this method in ViewController >>  [[[self tabBarController] rotationgFooterView] frame].size.height;
    return 49.0;
}

+(CGFloat)contentHeight
{
    return [LayoutUtil screenHeight] - [LayoutUtil navigationBarHeight];
}

+(CGFloat)contentY
{
    return [LayoutUtil statusBarHeight] + [LayoutUtil navigationBarHeight];
}

+(BOOL)isAspectRatio3x2
{
    return ([LayoutUtil fullScreenHeight] / [LayoutUtil screenWidth] == 3.0 / 2.0);
}

+(CGFloat)screenScale
{
    return ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) ? [[UIScreen mainScreen] scale] : 1.0;
}

MKMapView+Logo.m

- (UIView*)getGoogleLogo
{
    NSArray *subviews = [self subviews];
    if (subviews && [subviews count] < 2) return nil;

    UIView *logoView = [[self subviews] objectAtIndex:1];
    if ([logoView isKindOfClass:[UIImageView class]] != YES) return nil;
    if (logoView.frame.size.width != 69 || logoView.frame.size.height != 23) return nil;
    return logoView;
}

ProjectName-Prefix.pch

#define _(key) NSLocalizedString(key, key)

UIButton+Make.m

+ (UIButton *)makeButtonWithTarget:(id)target action:(SEL)action image:(UIImage *)image
{   
    UIButton *button = [[UIButton alloc] init];
    button.contentMode = UIViewContentModeScaleAspectFit;
    [button setBackgroundImage:image forState:UIControlStateNormal];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    button.frame = CGRectMake(0, 0, image.size.width, image.size.height);

    image = nil;
    [image release];
    return button;
}

+ (UIButton *)makeButtonWithTarget:(id)target action:(SEL)action imageName:(NSString *)imageName
{
    UIImage *image = [UIImage imageNamed:imageName];
    return [self makeButtonWithTarget:target action:action image:image];
}

+ (UIButton *)makeButtonWithTarget:(id)target action:(SEL)action title:(NSString *)title
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.titleLabel.textColor = [UIColor blackColor];
    button.titleLabel.font = [UIFont boldSystemFontOfSize:16.0];
    [button setTitle:_(title) forState:UIControlStateNormal];
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

    return button;
}

UIView+Layout.m

- (CGFloat)sX
{
    return self.frame.origin.x;
}

- (CGFloat)sY
{
    return self.frame.origin.y;
}

- (CGFloat)width
{
    return self.frame.size.width;
}

- (CGFloat)height
{
    return self.frame.size.height;
}

- (CGFloat)eX
{
    return self.frame.origin.x + self.frame.size.width;
}

- (CGFloat)eY
{
    return self.frame.origin.y + self.frame.size.height;
}