iOS 快速、随机崩溃 String 和 UIButton

Question

我的应用遇到奇怪的问题

环境:Xcode 7.1.1

我正在快速编写并遇到随机崩溃，我有以下功能:

private func _generateTitleButton(frame: CGRect,title:String)->UIButton{
    //Font Property:
    let buttonFont = UIFont(name: "Roboto-Regular", size: 13)!;

    let button = UIButton(frame:frame);
    //crash point
    button.setTitle(title, forState: .Normal); 
    button.setTitleColor(UIColor.whiteColor(), forState: .Normal);
    button.titleLabel!.font = buttonFont;
    button.contentMode = UIViewContentMode.Top;
    button.addTarget(self, action: "titleButtonClicked:", forControlEvents: .TouchDown);
    return button;
}

当实际字符串是枚举原始值时，我调用该函数:

private enum titleButtonsText : String{
    case NOTES  = "NOTES";
    case PEOPLE = "PEOPLE";
    case INFO   = "INFO";
}

函数使用:

self.infoButton = self._generateTitleButton(CGRect(origin: CGPoint(x: baseX, y: originY), size: buttonSize),title:titleButtonsText.INFO.rawValue);

在 _generateTitleButton 中，由于某种原因，title:String 是下一个字符串:

retain\0release\0autorelease\0retainCount\0zone\0hash\0superclass\0description\0debugDescription\0scrollViewDidScroll:\0scrollViewDidZoom:\0scrollViewWillBeginDragging:\0scrollViewWillEndDragging:withVelocity:targetContentOffset:\0scrollViewDidEndDragging:willDecelerate:\0scrollViewWillBegin正在减速:\0scrollViewDidEnd减速:\0scrollViewDidEndScrollingAnimation:\0viewForZoomingInScrollView:\0scrollViewWillBeginZooming:withView:\0scrollViewDidEndZooming:withView:atScale:\0scrollViewShouldScrollToTop:\0scrollViewDidScrollToTop:\0_performScrollTest:withIterations:rowsToScroll:inComponent:\0tableView:numberOfRowsInSection:\0tableView:cellForRowAtIndexPath:\0numberOfSectionsInTableView:\0tableView:titleForHeaderInSection :\0tableView:titleForFooterInSection:\0tableView:canEditRowAtIndexPath:\0tableView:canMoveRowAtIndexPath:\0sectionIndexTitlesForTableView:\0tableView:sectionForSectionIndexTitle:atIndex:\0tableView:commitEditingStyle:forRowAtIndexPath:\0tableView:moveRowAtIndexPath:toIndexPath:\0setSoundsEnabled:\0reload\0reloadData对于列

在崩溃点打印self:

self = 0x0000000000000010 {
  UIKit.UIView = {
    UIKit.UIResponder = {
      ObjectiveC.NSObject = {}
    }
  }
  backButton = <read memory from 0x178 failed (0 of 8 bytes read)>

  infoButton = <read memory from 0x180 failed (0 of 8 bytes read)>

  peopleButton = <read memory from 0x188 failed (0 of 8 bytes read)>

  notesButton = <read memory from 0x190 failed (0 of 8 bytes read)>

  _border = <read memory from 0x198 failed (0 of 8 bytes read)>

  title = <read memory from 0x1a0 failed (0 of 8 bytes read)>

  saveButton = <read memory from 0x1a8 failed (0 of 8 bytes read)>

  deleteButton = <read memory from 0x1b0 failed (0 of 8 bytes read)>

  titleLabel = <read memory from 0x1b8 failed (0 of 8 bytes read)>

}

p.s 该类是单例static var instance = CalendarMeetingViewTitle()

我最近做的唯一改变是向应用程序添加了带有解析功能的推送通知支持，并将按钮目标更改为另一种方法，到目前为止，它在过去几个月中一直有效

有什么想法吗？

谢谢!

Answer 1

我找到了解决方案，由于某种原因，它与单例有关。

改变

static var instance = CalendarMeetingViewTitle()

至

private static var _instance : CalendarMeetingViewTitle?
static var instance :CalendarMeetingViewTitle{
    if _instance == nil{
        _instance = CalendarMeetingViewTitle();
    }
    return _instance!;
}

解决问题