我已经实现了模块来将子视图控制器（SliderViewController）中的值传递给主视图控制器（MapViewController），但是当涉及到实现时，刚刚添加的位置丢失，因此无法添加坐标数组并因此呈现？除了将坐标保存到文本文件并重新加载之外，还有其他选择来保存坐标数组吗？
以下是我的工作：
ChildViewCOntroller
SliderViewController.h
#import <UIKit/UIKit.h>
#import "EFCircularSlider.h"
@protocol SliderViewControllerDelegate <NSObject>
- (void)passData:(float )itemVertical : (float )itemCircular ;
@end
@interface SliderViewController : UIViewController
@property (strong, nonatomic) IBOutlet UILabel *uiValue;
@property (strong, nonatomic) IBOutlet UISlider *uiSlider;
@property (strong, nonatomic) IBOutlet UIButton *btnReset;
@property (strong, nonatomic) IBOutlet UILabel *uiValue2;
@property (strong, nonatomic) EFCircularSlider* circularSlider;
@property (nonatomic) float verticalSliderValue;
@property (nonatomic) float circleSliderValue;
@property (nonatomic) id <SliderViewControllerDelegate> delegate;
- (IBAction)reset:(id)sender;
- (IBAction)sliderChange:(id)sender;
- (void)buttonClicked: (id)sender;
@end
SliderViewController.m
#import "SliderViewController.h"
#import <AudioToolbox/AudioServices.h>
#import "MapViewController.h"
@interface SliderViewController (){
NSString *valueV;
NSString *valueC;
}
@end
@implementation SliderViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_uiSlider.minimumValue = 0.0;
_uiSlider.maximumValue = 100.0;
[_uiSlider removeConstraints:_uiSlider.constraints];
[_uiSlider setTranslatesAutoresizingMaskIntoConstraints:YES];
float value = M_PI * -0.5 ;
_uiSlider.transform = CGAffineTransformMakeRotation(value);
CGRect sliderFrame = CGRectMake(60, 300, 100, 100);
_circularSlider = [[EFCircularSlider alloc] initWithFrame:sliderFrame];
[_circularSlider addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:_circularSlider];
[_circularSlider setCurrentValue:10.0f];
[_uiSlider setBackgroundColor:[UIColor colorWithWhite:0.0 alpha:0.5]];
CGRect screen = [[UIScreen mainScreen] bounds];
CGFloat width = CGRectGetWidth(screen);
CGFloat height = CGRectGetHeight(screen);
float scale = [[UIScreen mainScreen] scale];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake( 0, 450 ,width/2, 20);
[button setTitle:@"OK" forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:16.0];
button.titleLabel.adjustsFontSizeToFitWidth = TRUE;
[button setBackgroundColor:[UIColor orangeColor]];
[button addTarget: self
action: @selector(buttonClicked:)
forControlEvents: UIControlEventTouchDown];
[self.view addSubview:button];
}
- (void) buttonClicked: (id)sender
{
NSLog( @"Button clicked." );
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
-(void)valueChanged:(EFCircularSlider*)slider {
self.uiValue2.text = [NSString stringWithFormat:@"%.02f", slider.currentValue ];
_circleSliderValue = slider.currentValue;
valueC = self.uiValue2.text;
if(slider.currentValue > 20.0 && slider.currentValue < 30.0 ){
AudioServicesPlaySystemSound(1003);
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}
}
- (IBAction)reset:(id)sender {
[self writeToTextFile:valueV :valueC];
MapViewController * sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"MapViewController"];
sliderVC.verticalSliderValue = _uiSlider.value;
sliderVC.circleSliderValue =_circularSlider.currentValue;
[sliderVC passData:_uiSlider.value :_circularSlider.currentValue ];
sliderVC.modalPresentationStyle = UIModalPresentationCurrentContext;
[self dismissViewControllerAnimated:YES completion:nil];
}
-(void) writeToTextFile:(NSString*) values : (NSString*) values2 {
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:@"%@/slider.txt",documentsDirectory];
NSString *content = [NSString stringWithFormat:@"%@%@%@%@", values , @"\n" , values2 , @"\n" ];
[content writeToFile:fileName
atomically:YES
encoding:NSStringEncodingConversionAllowLossy
error:nil];
NSLog(@"%@",documentsDirectory);
[self displayContent];
}
-(void) displayContent{
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:@"%@/slider.txt",
documentsDirectory];
NSString *content = [[NSString alloc] initWithContentsOfFile:fileName
usedEncoding:nil
error:nil];
NSLog(@"%@",content);
}
- (IBAction)sliderChange:(id)sender {
UISlider *slider = (UISlider *)sender;
NSString *newValue = [NSString stringWithFormat:@"%.2f" , slider.value];
_verticalSliderValue = slider.value;
self.uiValue.text = newValue;
valueV = self.uiValue.text;
if(slider.value > 30 && slider.value < 50){
AudioServicesPlaySystemSound(1003);
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
MasterViewController
MapViewController.h
#import <MessageUI/MessageUI.h>
#import <GoogleMaps/GoogleMaps.h>
#import <UIKit/UIKit.h>
#import "SliderViewController.h"
@interface MapViewController : UIViewController<GMSMapViewDelegate , SliderViewControllerDelegate>{
}
@property (nonatomic) float verticalSliderValue;
@property (nonatomic) float circleSliderValue;
@end
MapViewCntroller.m
#import "MapViewController.h"
#import "CheckPoints.h"
#import "NSURLRequestSSL.h"
#import "ToastView.h"
@interface MapViewController () {
GMSMapView *mapView_;
NSMutableArray *array;
GMSCameraPosition *camera;
NSArray *_styles;
NSArray *_lengths;
NSArray *_polys;
double _pos, _step;
CLLocationCoordinate2D p;
}
@end
@implementation MapViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self getTime];
array = [[NSMutableArray alloc] init];
// Create a GMSCameraPosition that tells the map to display the
// coordinate -33.86,151.20 at zoom level 6.uisplatch
camera = [GMSCameraPosition cameraWithLatitude:22.2855200
longitude:114.1576900
zoom:12];
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView_.delegate = self;
mapView_.myLocationEnabled = YES;
mapView_.settings.compassButton = YES;
mapView_.settings.myLocationButton = YES;
// mapView_.delegate = self;
self.view = mapView_;
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(22.2855200, 114.1576900);
marker.title = @"My place";
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// defaults
float latitide = [defaults floatForKey:@"lati"];
float longitude = [defaults floatForKey:@"longi"];
NSString *desp = [defaults objectForKey:@"desp"];
if(latitide!=0.00&&longitude!=0.00) {
CLLocationCoordinate2D position = CLLocationCoordinate2DMake(latitide, longitude);
marker.position = CLLocationCoordinate2DMake(position.latitude, position.longitude);
}
if(desp.length > 0 ){
marker.title = desp;
}
marker.snippet = @"HK";
marker.map = mapView_;
}
...
- (void)passData:(float )value1 : (float )valueCiruclar
{
NSLog(@"This was returned from ViewControllerB %ff",value1);
NSLog(@"This was returned from ViewControllerSlider %ff",valueCiruclar);
[mapView_ clear];
NSLog(@"This was map received");
CheckPoints *myCar=[[CheckPoints alloc] init];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
float latitide = [defaults floatForKey:@"lati"];
float longitude = [defaults floatForKey:@"longi"];
NSString *desp = [defaults objectForKey:@"desp"];
[myCar setLatitude:latitide];
[myCar setLongitude:longitude];
[myCar setDesp:desp];
[myCar setState:[desp length] > 0 ? 0 : 1];
[CarArray addObject:myCar];
NSLog(@"This was returned lat from ViewControllerB %ff",[myCar getLatitude]);
NSLog(@"This was returned longi from ViewControllerSlider %ff",[myCar getLongitude]);
NSLog(@"This was returned desp from ViewControllerB %@",[myCar getDesp]);
NSLog(@"This was returned state from ViewControllerSlider %i",[myCar getState]);
lastChk = CarArray.lastObject;
[self writeToTextFile:[NSString stringWithFormat:@"%@%@%@%@%@%@", lastChk.getDesp , @"\n",[NSString stringWithFormat:@"%f", lastChk.getLatitude],
@"\n", [NSString stringWithFormat:@"%f", lastChk.getLongitude], @"\n" ]];
NSLog(@"This was map arraoy count @%i" , [CarArray count]);
for (int i = 0; i < [CarArray count]; i++) {
CheckPoints *current = [CarArray objectAtIndex:i];
if(current.getLatitude != lastChk.getLatitude && current.getLongitude != lastChk.getLongitude){
[current setState:1];
NSString* previousTitle = [NSString stringWithFormat:@"%@%@", @"Checkpoint" ,[NSString stringWithFormat:@"%i", i+1]];
[current setDesp:previousTitle];
}
}
[self addMarkers];
-(void) mapView:(GMSMapView *)mapView didLongPressAtCoordinate:(CLLocationCoordinate2D)coordinate{
p = coordinate;
SliderViewController * sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"SliderViewController"];
sliderVC.view.backgroundColor = [UIColor colorWithWhite:1.0 alpha:1.0];
sliderVC.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentViewController:sliderVC animated:YES completion:NULL];
}
答案 0 :(得分：1)
-(void) mapView:(GMSMapView *)mapView didLongPressAtCoordinate:(CLLocationCoordinate2D)coordinate
{
p = coordinate;
SliderViewController * sliderVC = [self.storyboard instantiateViewControllerWithIdentifier:@"SliderViewController"];
sliderVC.view.backgroundColor = [UIColor colorWithWhite:1.0 alpha:1.0];
sliderVC.modalPresentationStyle = UIModalPresentationCurrentContext;
**[sliderVC setDelegate:self]**
[self presentViewController:sliderVC animated:YES completion:NULL];
}
和
- (IBAction)reset:(id)sender
{
[self writeToTextFile:valueV :valueC];
[self.delegate passData:_uiSlider.value :_circularSlider.currentValue ];
[self dismissViewControllerAnimated:YES completion:nil];
}
不要创建新实例。你需要的只是使用委托。