How to save UITextField Text to NSString? - ios

Question

In my main view controller, I have a UITextField, and I am trying to save the text input into it to a NSString in my Homework model(class).
Homework.h
#import <Foundation/Foundation.h>
#interface Homework : NSObject
#property (nonatomic, strong) NSString *className;
#property (nonatomic, strong) NSString *assignmentTitle;
#end
Homework.m
#import "Homework.h"
#implementation Homework
#synthesize className = _className;
#synthesize assignmentTitle = _assignmentTitle;
#end
In my assignmentViewController, I create an object of type Homework and try to set it equal to whatever is entered into the the UITextField when the Save Button is pressed.
Assignment View Controller
#import <UIKit/UIKit.h>
#import "Homework.h"
#interface Assignment : UIViewController {
}
#property(nonatomic) IBOutlet UITextField *ClassNameField;
#property(nonatomic) IBOutlet UILabel *ClassNameLabel;
#property (weak, nonatomic) IBOutlet UIButton *SaveButton;
#property (nonatomic, strong) Homework *homeworkAssignment;
- (IBAction)Save:(UIButton *)sender;
#end
AssignmentViewController.m
- (IBAction)Save:(UIButton *)sender {
self.homeworkAssignment.className = self.ClassNameField.text;
NSLog(#"SaveButtonPressed %#", self.homeworkAssignment.className);
}
The NSLog prints out that className is (null). Can anyone help me figure out what I am doing wrong? This is my first ever iOS app (besides Hello World).
Edit: This is using ARC
Edit: I tried changing
self.homeworkAssignment.className = self.ClassNameField.text; to
self.homeworkAssignment.className = #"TEST";
and the log still shows (Null).

Answer 1

Double check you properly linked ClassNameField outlet and that you're initializing homeworkAssignment. Something like.-
self.homeworkAssignment = [[Homework alloc] init];
By the way, you should consider using camelCase notation for your variable names :)

Answer 2

Well to be honest the first steps are always hard but you should learn it the right way, héhé
First of all synthesize this way:
#synthesize labelAssignmentTitle,labelClassName;
or
#synthesize labelAssignmentTitle;
#synthesize labelClassName;
there is no need to do the following:
#synthesize className = _className;
#synthesize assignmentTitle = _assignmentTitle;
Now if you initialize the right way from the the start you'll find it a lot easier later!
HomeWork.h
#interface HomeWork : NSObject
#property (nonatomic, strong) NSString *className;
#property (nonatomic, strong) NSString *assignmentTitle;
-(id)initWithClassName:(NSString *)newClassName andAssignmentTitle:(NSString*)newAssigmentTitle;
HomeWork.m
#implementation HomeWork
#synthesize assignmentTitle,className;
-(id)initWithClassName:(NSString *)newClassName andAssignmentTitle:(NSString*)newAssigmentTitle {
self = [super init];
if(self){
assignmentTitle = newAssigmentTitle;
className = newClass;
}
return self;
}
#end
ViewController.m
- (IBAction)saveIt:(id)sender {
HomeWork *newHomeWork = [[HomeWork alloc]initWithClassName:[labelClassName text]andAssignmentTitle:[labelAssignmentTitle text]];
}
Because of this, you directly make a newHomeWork object with the parameters given by your two UITextFields.
Now print it out in your logmessage and see what happends ;)