iOS 7 中的自定义 UIPickerView 崩溃

Question

我制作了一个Custom UIPickerView with three Components each showing label on Selection Indicator，它在 iOS 6 中运行良好。

但我在 iOS 7 中遇到了崩溃。

这是我的代码：

ViewController.h

#define kDaysComponent 0
#define kHoursComponent 1
#define kMinutesComponent 2

#import <UIKit/UIKit.h>
#import "LabeledPickerView.h"

@interface ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate,UITextFieldDelegate>
{
    NSMutableArray *arrDays;
    NSMutableArray *arrHours;
    NSMutableArray *arrMinutes;

    LabeledPickerView *timePicker;
    IBOutlet UITextField *txtTimeLimit;
}

@property(nonatomic, retain) NSMutableArray *arrDays;
@property(nonatomic, retain) NSMutableArray *arrHours;
@property(nonatomic, retain) NSMutableArray *arrMinutes;

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize arrDays;
@synthesize arrHours;
@synthesize arrMinutes;

- (void)viewDidLoad
{

    self.arrDays = [[NSMutableArray alloc]initWithCapacity:100];
    for (NSInteger i = 0; i < 100; i++){
        [arrDays addObject:[NSString stringWithFormat:@"%d",i]];
    }
    //self.arrDays = arrDays;
    self.arrHours = [[NSMutableArray alloc]initWithCapacity:24];
    for (NSInteger i = 0; i < 24; i++){
        [arrHours addObject:[NSString stringWithFormat:@"%d",i]];
    }
    //self.arrHours = arrHours;
    self.arrMinutes = [[NSMutableArray alloc]initWithCapacity:60];
    for (NSInteger i = 0; i < 60; i++){
        [arrMinutes addObject:[NSString stringWithFormat:@"%d",i]];
    }
    //self.arrMinutes = arrMinutes;

    [self.navigationController setNavigationBarHidden:YES];

    [super viewDidLoad];


}

-(IBAction)Click:(id)sender{

    timePicker = [[LabeledPickerView alloc] init];
    timePicker.showsSelectionIndicator = YES;
    timePicker.dataSource = self;
    timePicker.delegate = self;
    [timePicker addLabel:@"Days" forComponent:kDaysComponent forLongestString:@"Hours"];
    [timePicker addLabel:@"Hours" forComponent:kHoursComponent forLongestString:@"Hours"];
    [timePicker addLabel:@"Mins" forComponent:kMinutesComponent forLongestString:@"Mins"];

    UIToolbar* toolbar = [[UIToolbar alloc] init];
    toolbar.barStyle = UIBarStyleBlackTranslucent;
    [toolbar sizeToFit];

    //to make the done button aligned to the right
    UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    UIBarButtonItem *flexibleSpaceRight = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

    UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(doneClicked:)];


    UIBarButtonItem *unlimitedButton = [[UIBarButtonItem alloc] initWithTitle:@"Unlimited" style:UIBarButtonItemStyleBordered target:self action:@selector(unlimitedClicked:)];

    [unlimitedButton setTintColor:[UIColor colorWithRed:100.0f/255.0f green:197.0f/255.0f blue:84.0f/255.0f alpha:1.0f]];

    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleDone target:self action:@selector(cancelClicked:)];

    [toolbar setItems:[NSArray arrayWithObjects:cancelButton,flexibleSpaceLeft,unlimitedButton,flexibleSpaceRight,doneButton, nil]];

    //custom input view
    txtTimeLimit.inputView = timePicker;
    txtTimeLimit.inputAccessoryView = toolbar;
}
-(void)doneClicked:(id) sender
{
    [txtTimeLimit resignFirstResponder]; //hides the pickerView

    NSInteger daysRow = [timePicker selectedRowInComponent: kDaysComponent];
    NSInteger hoursRow = [timePicker selectedRowInComponent: kHoursComponent];
    NSInteger minutesRow = [timePicker selectedRowInComponent: kMinutesComponent];
    NSString *days = [arrDays objectAtIndex:daysRow];
    NSString *hours = [arrHours objectAtIndex:hoursRow];
    NSString *minutes = [arrMinutes objectAtIndex:minutesRow];

    txtTimeLimit.text = [[NSString alloc] initWithFormat:
                         @"Expires in [%@] Days [%@] Hours [%@] Minutes.",days,hours,minutes];
    if ([txtTimeLimit.text isEqualToString:@""])
    {

    }
    else
    {

    }
}

-(void)cancelClicked:(id) sender
{
    [txtTimeLimit resignFirstResponder]; //hides the pickerView
}

-(void)unlimitedClicked:(id) sender
{
    [txtTimeLimit resignFirstResponder]; //hides the pickerView
    txtTimeLimit.text = @"Select Time Limit";
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark Picker View Delegate

- (NSInteger)numberOfComponentsInPickerView:(LabeledPickerView *)pickerView
{
    return 3;
}

- (NSInteger)pickerView:(LabeledPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (component == kDaysComponent)
    {
        return [self.arrDays count];
    }
    else if (component == kHoursComponent)
    {
        return [self.arrHours count];
    }
    else if (component == kMinutesComponent)
    {
        return [self.arrMinutes count];
    }
    return 0;
}

- (NSString *)pickerView:(LabeledPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (component == kDaysComponent)
    {
        NSLog(@"%@",[arrDays objectAtIndex:row]);
        return [self.arrDays objectAtIndex:row];
    }
    else if (component == kHoursComponent)
    {
        NSLog(@"%@",[arrHours objectAtIndex:row]);
        return [self.arrHours objectAtIndex:row];
    }
    else if (component == kMinutesComponent)
    {
        return [self.arrMinutes objectAtIndex:row];
    }
    return 0;

}

#pragma mark TEXT FIELD DELEGATE

- (BOOL)textFieldShouldBeginEditing:(UITextField *)aTextField
{
    [self Click:aTextField];
    return YES;

}

我将UIPickerView 显示为UITextField 的输入视图，并且每次我仅在iOS 7 中收到此错误：

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 5 beyond bounds [0 .. 2]'

我不知道它有什么问题。谁能帮我解决这个问题？

Answer 1

你的崩溃告诉你问题是什么：

-[__NSArrayM objectAtIndex:]: index 5 beyond bounds [0 .. 2]'

当您的数组仅包含 3 个对象时，您试图在索引 5 处获取对象的值。

放置一个断点并检查数组是否包含您所期望的以及组件值是否符合您的期望。

Answer 2

请在延迟一秒后尝试设置 txtTimeLimit.inputView。

[self performSelector:@selector(setInputView:) withObject:timePicker afterDelay:1];


- (void)setInputView:(LabeledPickerView*)picker {
   txtTimeLimit.inputView = picker;
}

我认为这与动画有关....

Answer 3

你必须关心几件事，

首先是委托和数据源方法。 如果您收到有关委托和数据源的警告，请像这样更正代码

timePicker.dataSource = (id)self;
timePicker.delegate = (id)self;

然后检查数组。希望它能解决您的问题。