Question

创建的UIBarButtonItem为什么显示不出来

Answer 1

[cpp]viewplaincopy//首先需要创建一个NSMutableArrayNSMutableArray*buttons=[[NSMutableArrayalloc]initWithCapacity:3];[buttonsautorelease];//创建一个UIBarButtonItem系统刷新按钮并且加入到Array中UIBarButtonItem*freshButton=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefreshtarget:selfaction:@selector(OnrefreshMap:)];[buttonsaddObject:freshButton];[freshButtonrelease];//创建一个空格，加入到array，用来将下面加入的按钮按照右边对齐UIBarButtonItem*SpaceButton=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpacetarget:nilaction:nil];[buttonsaddObject:SpaceButton];[SpaceButtonrelease];//创建一个系统搜索按钮，加入到array，放到右边UIBarButtonItem*searchSelfButton=[[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSearchtarget:selfaction:@selector(OnFindSelf:)];[buttonsaddObject:searchSelfButton];[searchSelfButtonrelease];//最后，将array设置给toolbar[toolbarsetItems:buttonsanimated:YES];[toolbarsizeToFit];