UIBarButtonItem

Кнопка в тулбаре/навбаре с красивой иконкой.

UIImage *faceImage = [UIImage imageNamed:(screenLocked) ? @"Locked" : @"Unlocked"];
UIButton *lockButton = [UIButton buttonWithType:UIButtonTypeCustom];
lockButton.bounds = CGRectMake(0, 0, faceImage.size.width, faceImage.size.height);
[lockButton setImage:faceImage forState:UIControlStateNormal];
[lockButton addTarget:self action:@selector(lockScreen:) forControlEvents:UIControlEventTouchUpInside];
lockButton = [[UIBarButtonItem alloc] initWithCustomView:lockButton];