我知道这已经在这里被问过并且我已经使用了它的代码但我仍然无法将double grandTotal（从InitialStoreViewController）的值传递给double isSomethingEnabled（在ViewController中）。这是我的视图控制器文件：
InitialStoreViewController.h
#import <UIKit/UIKit.h>
#import "InitialStoreViewController.h"
#import "ViewController.h"
@interface InitialStoreViewController : UITableViewController<UITextFieldDelegate>
{
// TargetViewCon TargetViewController *targetView;
IBOutlet UILabel *peasLabel;
IBOutlet UILabel *eggsLabel;
IBOutlet UILabel *milkLabel;
IBOutlet UILabel *beansLabel;
// requested amounts of each product
int peasAmountInt;
int eggsAmountInt;
int milkAmountInt;
int beansAmountInt;
double peasTotal;
double eggsTotal;
double milkTotal;
double beansTotal;
double grandTotal;
}
- (IBAction)peasStepper:(UIStepper *)sender;
- (IBAction)eggsStepper:(UIStepper *)sender;
- (IBAction)milkStepper:(UIStepper *)sender;
- (IBAction)beansStepper:(UIStepper *)sender;
- (IBAction)calcTotal:(UIBarButtonItem *)sender;
@property double price;
@property double priceToPass;
//this method is
//- (void) stepperAction: (UIStepper*)stepper toLabel: (UILabel*)label;
@end
InitialStoreViewController.m
#import "InitialStoreViewController.h"
#import "ViewController.h"
#import "Product.h"
@implementation InitialStoreViewController
- (void)viewDidLoad
{
//sunday:
[super viewDidLoad];
}
- (IBAction)peasStepper:(UIStepper *)sender
{
peasAmountInt = (int) sender.value;
NSLog(@"Peas Amount: %i", peasAmountInt);
peasLabel.text = [NSString stringWithFormat:@"%i", peasAmountInt];
//Initiating object of class Product
Product *peas = [[Product alloc]init];
peas.amountInt = peasAmountInt;
peasTotal = [peas multiplyAmount: peas.amountInt byPrice:0.95];
NSLog(@"Total amount for peas: %f", peasTotal);
grandTotal = peasTotal + eggsTotal + milkTotal + beansTotal;
NSLog(@"TOTAL Amount: %f", grandTotal);
}
- (IBAction)eggsStepper:(UIStepper *)sender
{
eggsAmountInt = (int) sender.value;
NSLog(@"Eggs Amount: %i", eggsAmountInt);
eggsLabel.text = [NSString stringWithFormat:@"%i", eggsAmountInt];
//Initiating object of class Product
Product *eggs = [[Product alloc]init];
eggs.amountInt = eggsAmountInt;
eggsTotal = [eggs multiplyAmount: eggs.amountInt byPrice:2.10];
NSLog(@"Total amount for eggs: %f", eggsTotal);
grandTotal = peasTotal + eggsTotal + milkTotal + beansTotal;
NSLog(@"TOTAL Amount: %f", grandTotal);
}
- (IBAction)milkStepper:(UIStepper *)sender
{
milkAmountInt = (int) sender.value;
NSLog(@"Milk Amount: %i", milkAmountInt);
milkLabel.text = [NSString stringWithFormat:@"%i", milkAmountInt];
//Initiating object of class Product
Product *milk = [[Product alloc]init];
milk.amountInt = milkAmountInt;
milkTotal = [milk multiplyAmount: milk.amountInt byPrice:1.30];
NSLog(@"Total amount for milk: %f", milkTotal);
grandTotal = peasTotal + eggsTotal + milkTotal + beansTotal;
NSLog(@"TOTAL Amount: %f", grandTotal);
}
- (IBAction)beansStepper:(UIStepper *)sender
{
beansAmountInt = (int) sender.value;
NSLog(@"Beans Amount: %i", beansAmountInt);
beansLabel.text = [NSString stringWithFormat:@"%i", beansAmountInt];
//Initiating object of class Product
Product *beans = [[Product alloc]init];
beans.amountInt = beansAmountInt;
beansTotal = [beans multiplyAmount: beans.amountInt byPrice:1.30];
NSLog(@"Total amount for beans: %f", beansTotal);
grandTotal = peasTotal + eggsTotal + milkTotal + beansTotal;
NSLog(@"TOTAL Amount: %f", grandTotal);
}
- (IBAction)calcTotal:(UIBarButtonItem *)sender
{
grandTotal = peasTotal + eggsTotal + milkTotal + beansTotal;
NSLog(@"TOTAL Amount: %f", grandTotal);
}
//sunday
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if([segue.identifier isEqualToString:@"showDetailSegue"]){
UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
ViewController *controller = (ViewController *)navController.topViewController;
// controller.isSomethingEnabled = YES;
controller.isSomethingEnabled = &(grandTotal);
}
}
@end
ViewController.h
#import <UIKit/UIKit.h>
#import "InitialStoreViewController.h"
@interface ViewController : UIViewController <UIPickerViewDataSource,
UIPickerViewDelegate>
{
NSArray *news;
NSMutableData *data;
double isSomethingEnabled;
}
@property(nonatomic) double *totalLabelDouble;
@property(nonatomic) double *isSomethingEnabled;
@property (nonatomic, strong) NSArray *currencyArray;
@property (weak, nonatomic) IBOutlet UILabel *totalLabel;
@property (weak, nonatomic) IBOutlet UIPickerView *picker;
@end
ViewController.m
#import "ViewController.h"
#import "Product.h"
#import "InitialStoreViewController.h"
@interface ViewController ()
@end
@implementation ViewController
//double totalLabelDouble = double isSomethingEnabled;
@synthesize currencyArray, totalLabel, picker;
- (void)viewDidLoad
{
[super viewDidLoad];
//checking if value of grandTotal was passed to this view controller:
NSLog(@"HHHHHHHHHHHHHHHHHHHHHHHHHHHH :%f", isSomethingEnabled);
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSURL *url = [NSURL URLWithString:@"http://www.apilayer.net/api/live?access_key=0b8125d8ca8e2801643e360440409165"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
// Do any additional setup after loading the view, typically from a nib.
//connection:willCacheResponse
//connection:didReceiveResponse
//connection:didReceiveData
//connectionDidFinishLoading
//connection:didFailWithError
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
data = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
[data appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
news= [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//[mainTableView reloadData];
NSLog(@"RAW DATA Marcin %@", data);
//NEW Stuff:
// Now create a NSDictionary from the JSON data
// NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
// Create a new array to hold the locations
// NSMutableArray *locations = [[NSMutableArray alloc] init];
// Get an array of dictionaries with the key "locations"
// NSArray *array = [jsonDictionary objectForKey:@"USDGBP"];
// for (id USDGBP in array)
//NSLog(@"VALUEEEEEE %@", array);
// NSLog (@"%@", [[arrayController selectedObjects] valueForKey:@"USDGBP"]);
NSString *json_string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Data AS STRING %@", json_string);
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
double usdgbpValue = [jsonDict[@"quotes"][@"USDGBP"] doubleValue];
//NSArray *xxx = [jsonDict[@"quotes"][@"USDGBP"] array];
//NSLog(@"VALUEEEEEE %@", xxx);
NSDictionary *jsonDict2 = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
//double usdgbpValue2 = [jsonDict[@"quotes"][@"USDGBP"] doubleValue];
NSArray *CurrencyArray = [jsonDict2 objectForKey:@"quotes"];
NSLog(@"VALUE %@", CurrencyArray);
//below causing crash
//currencyArray = [[NSArray alloc]initWithArray:CurrencyArray];
//currencyArray = CurrencyArray;
//double usdgbpValue3 = [NSArray[@"USDGBP"]currencyArray];
NSLog(@"USDGBP :%f", usdgbpValue);
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
//here to display message that internet connection is needed
}
//Creating product classes
//static Product *peas = nil;
//peas = [[Product alloc]init];
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UIPickerView Datasource & Delegate Methods
// returns the number of 'columns' to display.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
// returns the # of rows in each component..
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return [currencyArray count];
}
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
__TVOS_PROHIBITED
{
return currencyArray[row];
}
/// NEW CODE
//NSLog(@"USDGBP :%f", isSomethingEnabled);
//UILabel totalLabel.text = [NSString stringWithFormat: @"%d",
//isSomethingEnabled];
@end
当我运行代码时，我获得了grandTotal的值，但是代码显示0.000的{{1}}：
isSomethingEnabled