“UIView”没有可见界面声明选择器“setDate:Animated”；答案

【问题标题】：No visible interface for "UIView" declares the selector "setDate:Animated";“UIView”没有可见界面声明选择器“setDate:Animated”；
【发布时间】：2015-04-08 19:30:17
【问题描述】：

你能帮我找出我在这里做错了什么吗？线上的错误

[self.datePicker setDate:now animated:NO];

说

“UIView”没有可见界面声明选择器“setDate:Animated”；

上线

NSDate *selected = [self.datePicker date];

说

“UIView”没有可见界面声明选择器“日期”；

#import "BIDDatePickerViewController.h"

@interface BIDDatePickerViewController ()

@property (strong, nonatomic) IBOutlet UIView *datePicker;

@end

@implementation BIDDatePickerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSDate *now = [NSDate date];
    [self.datePicker setDate:now animated:NO];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (IBAction)buttonPressed:(id)sender {

    NSDate *selected = [self.datePicker date];
    NSString *message = [[NSString alloc] initWithFormat: @"The date and time you selected is %@", selected];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Date and time selected"
                                                    message: message
                                                   delegate: nil
                                          cancelButtonTitle: @"That's so true!"
                                          otherButtonTitles: nil];
    [alert show];

}

@end

更新

尝试将 UIView 更改为 UIDatePicker，现在它可以构建但崩溃了

2015-04-08 22:37:26.211 Pckers[3317:211755] -[UIView setDate:animated:]:    
unrecognized selector sent to instance 0x7faa32f26b90
2015-04-08 22:37:26.215 Pckers[3317:211755] *** Terminating app due to      
uncaught exception 'NSInvalidArgumentException', reason: '-[UIView             
setDate:animated:]: unrecognized selector sent to instance 0x7faa32f26b90'
*** First throw call stack:

【问题讨论】：

将您的 datePicker 属性更改为 UIDatePicker 而不是 UIView。
现在它崩溃了 ' 2015-04-08 22:33:36.440 Pckers[3231:207204] -[UIView setDate:animated:]: unrecognized selector sent to instance 0x7fda82f560b0 2015-04-08 22 ：33：36.448 Pckers [3231：207204] ***由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'-[UIView setDate：animated：]：无法识别的选择器发送到实例0x7fda82f560b0''
您是否真的将UIDatePicker 分配给您的datePicker 出口？听起来您已经分配了一个普通的旧 UIView。
重新检查，重新连接，它有所帮助。非常感谢！

标签： ios objective-c

【解决方案1】：

您必须将其更改为 UIDatePicker 我的建议是从情节提要中删除当前的，然后将其重新插入为 UIDatePicker 因为很可能您将其声明为 UIView

其他东西尝试弱引用你所有的IBOutlets，因为这里不需要额外的保留计数

【讨论】：