Sunday, June 9, 2013

UINavigationItem titleView example in Objective C (iOS).

UINavigationItem titleView

A custom view displayed in the center of the navigation bar when the receiver is the top item.

@property(nonatomic, retain) UIView *titleView

Discussion of [UINavigationItem titleView]
If this property value is nil, the navigation item’s title is displayed in the center of the navigation bar when the receiver is the top item. If you set this property to a custom title, it is displayed instead of the title. This property is ignored if leftBarButtonItem is not nil.[UINavigationItem titleView]

Custom views can contain buttons. Use the buttonWithType: method in UIButton class to add buttons to your custom view in the style of the navigation bar. Custom title views are centered on the navigation bar and may be resized to fit.

The default value is nil.

UINavigationItem titleView example.
Consider using UINib - it was exposed in iOS 4.0. It double perf since it caches the nib for you.

UINib *nib = [UINib nibWithNibName:@"TestView" bundle:nil];
UIView *myView = [[nib instantiateWithOwner:self options:nil] objectAtIndex:0]];
The objectAtIndex refers to the top level views in the NIB - typically there's one (index 0) but if there's many, you need to provide the index.

Once you have the view you can assign it to the navigationItem titleView

self.navigationItem.titleView = myView;
[myview release];

Example of [UINavigationItem titleView].
UIFont* font = [UIFont fontWithName:@"Bitsumishi" size:20];
CGSize maximumLabelSize = CGSizeMake(296,9999);
CGSize expectedLabelSize = [title sizeWithFont:font constrainedToSize:maximumLabelSize lineBreakMode:UILineBreakModeCharacterWrap];
CGRect frame = CGRectMake(0, 0, expectedLabelSize.width, expectedLabelSize.height);
UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];
label.font = font;
label.textAlignment = UITextAlignmentLeft;
label.text = title;
self.titleView = label;

UINavigationItem titleView example.
label = [[UILabel alloc] init];
label.backgroundColor = [UIColor clearColor];
label.font = [ UIFont fontWithName: @"XXII DIRTY-ARMY" size: 32.0 ];
label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.0f];
label.textAlignment = UITextAlignmentCenter;
label.textColor =[UIColor orangeColor];
CGFloat verticalOffset = 2;
NSString *reqSysVer = @"5.0";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)          
    if (categoryTitle.length > 8)
    label.frame = CGRectMake(0, 0, 300, 44);
    }else {
        label.frame = CGRectMake(0, 0, 80, 44);

    self.navigationItem.titleView = label; 
    [[UINavigationBar appearance] setTitleVerticalPositionAdjustment:verticalOffset   forBarMetrics:UIBarMetricsDefault];
     [[UIBarButtonItem appearance] setTintColor:[UIColor newBrownLight]];


End of UINavigationItem titleView example article.