Font names in iOS

Might be interesting for you as Quick Win within the Debugger:

(lldb) po [UIFont fontNamesForFamilyName:@"Helvetica Neue"]

(id) $1 = 0x079d8670 <__NSCFArray 0x79d8670>(
HelveticaNeue-Bold,
HelveticaNeue-CondensedBlack,
HelveticaNeue-Medium,
HelveticaNeue,
HelveticaNeue-Light,
HelveticaNeue-CondensedBold,
HelveticaNeue-LightItalic,
HelveticaNeue-UltraLightItalic,
HelveticaNeue-UltraLight,
HelveticaNeue-BoldItalic,
HelveticaNeue-Italic
)

source: http://stackoverflow.com/questions/11083954/uifont-fontwithname-font-name

Pull to refresh swift

var refresher: UIRefreshControl!

    override func viewDidLoad() {

        super.viewDidLoad()

//...

        initRefresher()

    }

    

    // MARK: Helper

    func initRefresher() {

        refresher = UIRefreshControl()

        refresher.attributedTitle = NSAttributedString(string: "Потяните вниз для обновления")

        refresher.addTarget(self, action: "refreshData", forControlEvents: UIControlEvents.ValueChanged)

        tableView.addSubview(refresher)

        

    }

    

    func refreshData() {

//... обновляемся

    refresher.endRefreshing() //выключаем обновление

    }

Хорошая статья: pull to refresh

Core Data NSPredicate checking for BOOL value

Based on Apple Document Here, we can use the following two methods to compare Boolean:

NSPredicate *newPredicate = [NSPredicate predicateWithFormat:@"anAttribute == %@",[NSNumber numberWithBool:aBool]];
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"anAttribute == YES"];

However, the above predicate cannot get out the ones with empty anAttribute. To deal with an empty attribute, you need the following method according to Apple document here:

predicate = [NSPredicate predicateWithFormat:@"firstName = nil"]; // it's in the document

or

predicate = [NSPredicate predicateWithFormat:@"firstName == nil"]; // == and = are interchangeable here

Corner Radius

import QuartzCore

...

view.layer.cornerRadius = 5;
view.layer.masksToBounds = YES;