語境子類UIToolbar和壓倒一切的drawRect: - UIBarButtonItems不顯示
我使用「initWithNavigationBarClass」的方法來初始化一個自定義工具欄一個UINavigationController,這裏是我的Alloc地初始化的UINavigationController
行navigationController = [[UINavigationController alloc] initWithNavigationBarClass:nil toolbarClass:[QuestionToolbar class]];
是類, 「QuestionToolbar」,我繼承UIToolbar和重寫drawRect中,這裏是drawRect方法:
- (void)drawRect:(CGRect)rect
{
[super drawRect:rect];
UIImage *backgroundImage = [UIImage imageNamed:@"44px_background_red.png"];
[backgroundImage drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
這裏是在相關的viewController代碼,我試圖添加UIBarButtonItems
UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *beginItem = [[UIBarButtonItem alloc] initWithTitle:@"Begin Quiz" style:UIBarButtonItemStylePlain target:self action:@selector(beginAction:)];
[beginItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIColor whiteColor], UITextAttributeTextColor,nil] forState:UIControlStateNormal];
NSArray *items = [NSArray arrayWithObjects:spacer, beginItem, spacer, nil];
[self.navigationController.toolbar setItems:items];
[self.navigationController setToolbarHidden:NO];
問題
我該如何去有關添加UIBarButtonItems這個工具,因爲它們不顯示向上時我嘗試添加它們?
我認爲這件事情與我壓倒一切的drawRect
我想我明白了這一點,我正在使用下面的代碼:[self.navigationController.toolbar setItems:items]哪些不起作用。但是,如果我使用self.toolbarItems =它的工作項目。不知道爲什麼? – drc 2013-04-25 17:23:25