ios Xcode：无效参数不满足
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Xcode: Invalid parameter not satisfying
提问by Henry F
I keep running into a pretty frustrating error in Xcode after implementing a date picker. The error in the debugger is: "Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: date"
在实现日期选择器后，我一直在 Xcode 中遇到一个非常令人沮丧的错误。调试器中的错误是：“由于未捕获的异常‘NSInternalInconsistencyException’而终止应用程序，原因：‘无效参数不满足：日期”
I've been going through my code for hours now, and can't find the issue. It may be because I'm not checking for nil, there is no date the first time the app installs and launches, so that may be causing the crash. If it is, how do I check for nil in this code? I'm still very new at programming, any help would be much appreciated. Here is the code:
我已经浏览了我的代码几个小时了，但找不到问题所在。可能是因为我没有检查 nil，应用程序第一次安装和启动时没有日期，因此可能导致崩溃。如果是，我如何检查此代码中的 nil？我对编程还是很陌生，任何帮助将不胜感激。这是代码：
#import "DatePickerViewController.h"
@implementation DatePickerViewController
@synthesize datePicker;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Initialization code
}
return self;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
UILocalNotification *localNotif = [[UILocalNotification alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"mm'/'dd'/'yyyy"];
NSDate *eventDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"DatePickerViewController.selectedDate"];
localNotif.fireDate = [eventDate dateByAddingTimeInterval:-13*60*60];
localNotif.timeZone = [NSTimeZone defaultTimeZone];
localNotif.alertBody = @"Tomorrow!";
localNotif.alertAction = nil;
localNotif.soundName = UILocalNotificationDefaultSoundName;
localNotif.applicationIconBadgeNumber = 0;
[[UIApplication sharedApplication]presentLocalNotificationNow:localNotif];
return YES;
}
- (void)viewDidLoad {
NSDate *storedDate = [[NSUserDefaults standardUserDefaults]
objectForKey:@"DatePickerViewController.selectedDate"];
[self.datePicker setDate:storedDate animated:NO];
}
- (IBAction)dateChanged:(id)sender {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDate *selectedDate = [self.datePicker date];
[defaults setObject:selectedDate forKey:@"DatePickerViewController.selectedDate"];
}
回答by Tomasz Wojtkowiak
You don't check if date is null, before using it, in ex.
在使用它之前，您不检查日期是否为空，例如。
(void)viewDidLoad {
NSDate *storedDate = [[NSUserDefaults standardUserDefaults]
objectForKey:@"DatePickerViewController.selectedDate"];
// add this check and set
if (storedDate == nil) {
storedDate = [NSDate date];
}
// ---
[self.datePicker setDate:storedDate animated:NO];
}
回答by Jerome Li
I've find a Debug way may help you debug where is the exception occurred and may help someone to debug with exception.
我发现一种 Debug 方式可以帮助您调试发生异常的位置，并且可以帮助某人进行异常调试。
navigate to breakpoint
Click the add button, and choose exception Breakpoint
Add breakpoint and make exception type to Objective-C
Run the code It will stop at the line which make crash happened!
导航到断点
单击添加按钮，然后选择异常断点
为Objective-C添加断点并使异常类型
运行代码它会停在使崩溃发生的那一行！
Hope this help~
希望这有帮助~
