現在顯示在UIToolbar上的彈性欄按鈕項目

Question

我知道它看起來很簡單，並且已經被問了很多次，但是我無法讓它工作。我想在我的工具欄中添加兩個按鈕。一個在右側，另一個在左側。這裏是代碼，但是應該顯示在右側的靈活代碼根本沒有出現。以下是代碼：

toolbar = [[UIToolbar alloc] init]; 
toolbar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44); 
NSMutableArray *items = [[NSMutableArray alloc] init]; 

[items addObject:[[UIBarButtonItem alloc] initWithTitle:@"next" style:UIBarButtonItemStylePlain target:self action:@selector(nextResult:)]]; 

UIBarButtonItem *done=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:@selector(showSearch:)]; 
[done setImage:[UIImage imageNamed:@"cancel"]]; 
[items addObject:done]; 

[toolbar setItems:items animated:NO]; 

Answer 1

您需要使用UIBarButtonSystemItemFlexibleSpace代替UIBarButtonSystemItemFixedSpace

代碼：

toolbar = [[UIToolbar alloc] init]; 
toolbar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44); 
NSMutableArray *items = [[NSMutableArray alloc] init]; 

[items addObject:[[UIBarButtonItem alloc] initWithTitle:@"next" style:UIBarButtonItemStylePlain target:self action:@selector(nextResult:)]]; 

UIBarButtonItem *space = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 
[items addObject:space]; 

[items addObject:[[UIBarButtonItem alloc] initWithTitle:@"cancel" style:UIBarButtonItemStylePlain target:self action:@selector(showSearch:)]]; 

[toolbar setItems:items animated:NO]; 

參考：UIBarButtonItem Class Reference

Answer 2

系統項目UIBarButtonSystemItemFixedSpace的項目是一個空格，而不是按鈕對象。因此它顯示出來。這只是沒有按鈕。

更改您的代碼

toolbar = [[UIToolbar alloc] init]; 
toolbar.frame = CGRectMake(0, 0, self.view.frame.size.width, 44); 
NSMutableArray *items = [[NSMutableArray alloc] init]; 

[items addObject:[[UIBarButtonItem alloc] initWithTitle:@"next" style:UIBarButtonItemStylePlain target:self action:@selector(nextResult:)]]; 

UIBarButtonItem *space = [[UIBarButtonItem alloc]initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 
[items addObject:space]; 

[items addObject:[[UIBarButtonItem alloc] initWithTitle:@"cancel" style:UIBarButtonItemStylePlain target:self action:@selector(showSearch:)]]; 

[toolbar setItems:items animated:NO];