NSInvalidArgumentException'，原因：'-[UILabel 视图]：无法识别的选择器发送到实例 0x7ffbd0da2680'

Question

下面是出现此错误的代码。

UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, self.view.bounds.size.height - 44.0f, self.view.bounds.size.width, 44.0f)];
    toolBar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
    [self.view addSubview:toolBar];    
    UIBarButtonItem *people = [[UIBarButtonItem alloc] initWithTitle:@"people" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
    UIBarButtonItem *food = [[UIBarButtonItem alloc] initWithTitle:@"food" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
    UIBarButtonItem *nature = [[UIBarButtonItem alloc] initWithTitle:@"nature" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
    UIBarButtonItem *sports = [[UIBarButtonItem alloc] initWithTitle:@"sports" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
    UIBarButtonItem *cats = [[UIBarButtonItem alloc] initWithTitle:@"cats" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
    UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 
    UILabel *lbl1 = [[UILabel alloc] init];
    [lbl1 setFrame:CGRectMake(0,5,100,20)];
    lbl1.backgroundColor=[UIColor clearColor];
    lbl1.textColor=[UIColor whiteColor];
    lbl1.userInteractionEnabled=YES;
    [self.view addSubview:lbl1];
    lbl1.text= @"TEST";
    [toolBar setItems:@[space, lbl1, people, food, nature, sports, cats, space]];

Answer 1

你的错误在这一行，因为你在工具栏中添加了标签。使用此代码

UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, self.view.bounds.size.height - 44.0f, self.view.bounds.size.width, 44.0f)];
toolBar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[self.view addSubview:toolBar];
UIBarButtonItem *people = [[UIBarButtonItem alloc] initWithTitle:@"people" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
UIBarButtonItem *food = [[UIBarButtonItem alloc] initWithTitle:@"food" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
UIBarButtonItem *nature = [[UIBarButtonItem alloc] initWithTitle:@"nature" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
UIBarButtonItem *sports = [[UIBarButtonItem alloc] initWithTitle:@"sports" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
UIBarButtonItem *cats = [[UIBarButtonItem alloc] initWithTitle:@"cats" style:UIBarButtonItemStylePlain target:self action:@selector(tap:)];
UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
lbl1 = [[UILabel alloc] init];
[lbl1 setFrame:CGRectMake(0,64,100,20)];
lbl1.backgroundColor=[UIColor clearColor];
lbl1.textColor=[UIColor redColor];
lbl1.userInteractionEnabled=YES;
[self.view addSubview:lbl1];
lbl1.text= @"TEST";
[toolBar setItems:@[space, people, food, nature, sports, cats, space]];

工具栏项目点击事件

-(IBAction)tap:(UIBarButtonItem*)sender{
    lbl1.text= sender.title;
}

NSInvalidArgumentException'，原因：'-[UILabel 视图]：无法识别的选择器发送到实例 0x7ffbd0da2680'

NSInvalidArgumentException', reason: '-[UILabel view]: unrecognized selector sent to instance 0x7ffbd0da2680'

objective-c

uitabbaritem

uitabbar

ios