方法调用后，NSArray不包含任何内容

Question

I'm calling a method passing two arrays to it as follow :

NSArray *marked_dates = [NSArray arrayWithObjects:[dateFormat dateFromString:@"19/03/2014"],[dateFormat dateFromString:@"17/04/2014"],[dateFormat dateFromString:@"12/02/2014"], nil];
NSArray *marked_colors = [NSArray arrayWithObjects:[UIColor greenColor],[UIColor greenColor],[UIColor greenColor],nil];
[calendar markDates:marked_dates withColors:marked_colors];

Below is the method receiving this :

-(void)markDates:(NSArray *)dates withColors:(NSArray *)colors {
    self.markedDates = dates;
    self.markedColors = colors;

    NSLog(@"%@",[NSString stringWithFormat:@"%d",[dates count]]);

    for (int i = 0; i<[self.markedDates count]; i++) {
        NSLog(@"%@",[NSString stringWithFormat:@"%@", self.markedDates[i]]);
    }

    [self setNeedsDisplay];
}

The log says 0 and I obviously don't get into the for loop.

Thanks for any help.

EDIT : I will also vote up for any information about the warning : "format string is not a string literal"

Below the declaration of the properties :

@property (nonatomic, retain) NSArray *markedDates;
@property (nonatomic, retain) NSArray *markedColors;

EDIT :

So yes, the formater gives null values. Here is how I did it :

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MM/dd/yyyy"];
NSLog(@"%@",[NSString stringWithFormat:@"%@",[dateFormat dateFromString:@"19/03/2014"]]);
//this prints "null"

EDIT with solution :

Bad mistake, I misconfigured the formatter using this worked for me, thank you all for your help.

[dateFormat setDateFormat:@"dd/MM/yyyy"];

Answer 1

The dates array is probably empty due to the date formatter only producing nil values. Fix the date formatter so it will correctly generate NSDate objects and it should work:

[dateFormat setDateFormat:@"dd/MM/yyyy"];

Answer 2

[dateFormat setDateFormat:@"dd/MM/yyyy"]; ?

Answer 3

First of all you should not create the property name and Local instance variable as same name. Because property it's self create instance var with _Property name.And the issue is with line.

NSArray *marked_dates = [NSArray arrayWithObjects:[dateFormat dateFromString:@"19/03/2014"],[dateFormat dateFromString:@"17/04/2014"],[dateFormat dateFromString:@"12/02/2014"], nil];

Add the date format also. check this again. let me know if you still facing the same issue.