Question

我知道它可能看起来非常简单并且被多次询问但是我无法让它工作。我想在我的工具栏中添加两个按钮。一个在右侧，另一个在左侧。这是代码，但是应该显示在右侧的灵活代码根本不会出现。这是代码：

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

代码：

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];

参考：UIBarButtonItem Class Reference

Answer 2

系统项UIBarButtonSystemItemFixedSpace的项目是空格，而不是按钮对象。因此它确实出现了。这只是没有按钮。

将您的代码更改为

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];

灵活的条形按钮项目现在显示在UIToolbar上

2 个答案: