Trouble with NSdate

I am writing a program that has multiple views. I want to pass a date variable between views. I made a global variable using extern NSDate *chooseDate. I declare the variable NSDate *dat开发者_如何学编程e on one of the views. I then set date = chooseDate. I then use the following code to add days to date;

NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay:(int)daycount];
date = [calendar dateByAddingComponents:components toDate:date options:0];

The problem seems to be that chooseDate is not being recognized as an NSDate. The code crashes at date = [calendar ...]. I am at a loss as to why this is happening. I hope I have explained the clearly. Any ideas?

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Probably it will work if you change chooseDate = [datePicker date]; to chooseDate = [[datePicker date] copy];. If it does, the rest should be pretty much self explanatory.

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You're setting chooseDate to an autoreleased instance. Are you sure it exists when you try to use it? You may need to retain it.