-[NSDictionary initWithObjects:forKeys:]:对象数(0)与键数(2)不同 [英] -[NSDictionary initWithObjects:forKeys:]: count of objects (0) differs from count of keys (2)
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问题描述
我收到
-[NSDictionary initWithObjects:forKeys:]:对象(0)的数量与键(2)的数量不同'
-[NSDictionary initWithObjects:forKeys:]: count of objects (0) differs from count of keys (2)'
这是我保存plist的代码.
here is my code in saving the plist.
@interface setting : UIViewController{
UIDatePicker *datePicker;
IBOutlet UILabel * morningtime;
UIDatePicker *afternoonpicker;
NSString*morningtime1;
NSString*afternoontime1;
IBOutlet UILabel *afternoontime;
}
@property (nonatomic,retain) IBOutlet UIDatePicker *datePicker;
@property (strong, nonatomic) IBOutlet UIDatePicker *afternoonpicker;
@property (nonatomic, retain) IBOutlet NSString *morningtime1;
@property (nonatomic, retain) IBOutlet NSString *afternoontime1;
@property (nonatomic, retain) IBOutlet UILabel *morningtime;
@property (nonatomic, retain) IBOutlet UILabel *afternoontime;
@property (weak, nonatomic) IBOutlet UIButton *morning;
- (IBAction)savetext:(id)sender {
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
// get documents path
NSString *documentsPath = [paths objectAtIndex:0];
// get the path to our Data/plist file
NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"Data.plist"];
self.morningtime1 = morningtime.text;
self.afternoontime1 = afternoontime.text;
NSDictionary *plistDict = [NSDictionary dictionaryWithObjects: [NSArray arrayWithObjects: morningtime1, afternoontime1, nil] forKeys:[NSArray arrayWithObjects: @"Morning", @"Afternoon", nil]];
NSString *error = nil;
// create NSData from dictionary
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
// check is plistData exists
if(plistData)
{
// write plistData to our Data.plist file
[plistData writeToFile:plistPath atomically:YES];
}
else
{
NSLog(@"Error in saveData: %@", error);
}
}
推荐答案
morningtime1
几乎可以肯定在这里nil
,过早地结束了数组列表.
morningtime1
is almost certainly nil
here, prematurely ending the array list.
如果您在此处使用了新的数组文字语法:
If you used the new array literal syntax here:
@[morningtime1, afternoontime1];
您会崩溃,因为将nil分配给NSArray
元素是非法的.
you would get a crash, because it's illegal to assign nil to an NSArray
element.
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