我已经遵循了几个指导视图控制器之间传递数据,但他们似乎涉及设置secondViewController的属性在任何等效的 - (无效) goToNextView方法。我试图找出如何使用在应用程序委托中创建的选项卡栏控制器从第一个值向第二个视图控制器中的属性赋值。UISlider数据从XIB的视图控制器传递到非XIB的视图控制器与UITabBarController
当前设置:
AppDelegate.m
@synthesize window;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
...
UITabBarController *tbc = [[UITabBarController alloc] init];
FirstViewController *vc1 = [[FirstViewController alloc] init];
SecondViewController *vc2 = [[SecondViewController alloc] init];
[tbc setViewControllers: [NSArray arrayWithObjects: vc1, vc2, nil]];
[[self window] setRootViewController:tbc];
[self.window makeKeyAndVisible];
return YES;
}
...
@end
FirstViewController.h
#import "SecondViewController.h"
@interface FirstViewController : UIViewController
{
SecondViewController *vc2;
IBOutlet UISlider *sizeSlider;
}
@property (nonatomic, retain) SecondViewController *vc2;
@property (strong, nonatomic) UISlider *mySlider;
-(IBAction) mySliderAction:(id)sender;
@end
FirstViewController.m
#import "FirstViewController.h"
#import "SecondViewController.h"
@implementation FirstViewController
@synthesize vc2, mySlider;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
UITabBarItem *tbi = [self tabBarItem];
[tbi setTitle:@"xib"];
}
return self;
}
...
- (IBAction) mySliderAction:(id)sender
{
NSString *str = [[NSString alloc] initWithFormat:@"%3.2f", mySlider.value];
if(self.vc2 == nil)
{
SecondViewController *viewTwo = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
self.vc2 = viewTwo;
}
vc2.sliderValueString = str;
}
...
@end
SecondViewController.h
#import <UIKit/UIKit.h>
#import "myView.h"
@interface SecondViewController : UIViewController
{
NSString *sliderValueString;
}
@property (copy) NSString *sliderValueString;
@end
SecondViewController.m
#import "SecondViewController.h"
@implementation SecondViewController
@synthesize sliderValueString;
- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)bundle
{
self = [super initWithNibName:nil bundle:nil];
if (self) {
UITabBarItem *tbi = [self tabBarItem];
[tbi setTitle:@"View 2"];
}
return self;
}
-(void) loadView
{
CGRect frame = [[UIScreen mainScreen] bounds];
myView *view = [[myView alloc] initWithFrame:frame];
printf("Slider Value: %s", [sliderValueString UTF8String]);
[self setView: view];
}
...
@end
myView.h和.M可能无关的问题,但我已经得到了.H子类的UIView,与.m创建的观点 - (id)initWithFrame:(CGRect)框架
我猜我分配第二个VC的属性在错误的地方(mySliderAction),因为第二个VC中的printf()是空白的,所以我的问题是:该属性应该分配在哪里,或者我在做什么错误,阻止第二个VC允许它的sliderValueSt戒指不被(或保持)分配?
谢谢!
谢谢!解决了这个问题! – user2280110