Question

我正在点击textField时创建UIPickerView。当我运行此代码时出现错误： Thread 1:Profram received signal:"SIGABRT"。

我在iPhone开发方面很陌生，但负责人不在，我正在接受一个项目。

如果你能让我知道这有什么问题......

这就是ViewController.h的样子：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {

IBOutlet UIPickerView *picker;
IBOutlet UITextField *text;

}


- (IBAction)showPicker:(id)sender;


@end

和ViewController.m：

#import "ViewController.h"
@implementation ViewController
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
     // e.g. self.myOutlet = nil;
 }

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}


- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
} else {
    return YES;


}
}

- (void)showPicker {

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.4];
[UIView setAnimationDelegate:self];
picker.center = CGPointMake(160, 240);
[UIView commitAnimations];


if (!self.navigationItem.rightBarButtonItem) {
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]     initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(done:)];
    [self.navigationItem setRightBarButtonItem:doneButton animated:YES];
  //  [doneButton release];
}   
}


- (void)hidePicker {

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.4];
[UIView setAnimationDelegate:self];
picker.center = CGPointMake(160, 240);
[UIView commitAnimations];


[self.navigationItem setRightBarButtonItem:nil animated:YES];
}


- (void)done:(id)sender {

[self hidePicker];

[self.navigationItem setRightBarButtonItem:nil animated:YES];
}


- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {

[self showPicker];

return NO;
}

Answer 1

- (IBAction)showPicker:(id)sender;

此函数未在.m文件中实现，而不是 - （void）showPicker使用上面的...

这有什么用......

- (void)done:(id)sender

Answer 2

选择器视图必须具有数据源才能显示数据，并且委托者必须具有响应事件的委托。通常我会通过采用相应的协议UIPickerViewDelegate和UIPickerViewDataSource来定义控制器。您的控制器没有，这可能意味着数据源和委托在另一个对象中。您应该检查界面构建器，紧急选择选择器并查看他委派的内容和数据源。如果你发现另一个类而不是你的控制器，你应该在那里查找bug。如果找到控制器的类，那么问题是您没有实现要填充的选择器视图的方法。作为参考，选择器至少要查看数据源方法：

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

祝你好运。

弹出UIPickerView（iphone）

2 个答案: