将NSString从View传递到另一个

Question

我正在尝试将NSString传递给另一个视图。

在我的第一个视图（是地图视图）中，我的代码是：

FirstView.m文件：

  

import“FlipsideViewController.h”

     

- （IBAction）displayDetails：（id）sender {

MyLocation *ann = [_mapView.selectedAnnotations objectAtIndex:([_mapView.selectedAnnotations count]-1)];

FlipsideViewController *flipsideViewController;
flipsideViewController=  [[FlipsideViewController alloc]init];
flipsideViewController.details =ann.name;
NSLog(@"ann.name:%@", ann.name);
NSLog(@"details:%@", flipsideViewController.details);

FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"details" bundle:nil];
    controller.delegate = self;     
  controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
    [controller release]; 

     

}

并且NSlog打印正确的字符串。但是，当我尝试将该字符串传递给名为details的

在我的FlipsideViewController.h中定义了：

  

NSString *详细信息;

     

@property（非原子，强）NSString *详细信息;

在FlipsideViewController.m

中

  

@synthesize详细信息; //每当我放入日志时，它都会打印空值

     

值：NSLog（@“ * ** * ** * ** * *** * detalli％@“，detalli）;

我的错在哪里？

Answer 1

在secondViewController中添加一个属性，一个类型为NSString的保留属性 如需添加属性，请阅读以下内容

http://cocoacast.com/?q=node/103

请编辑本节

FlipsideViewController *flipsideViewController;
flipsideViewController=  [[FlipsideViewController alloc]init];
flipsideViewController.details =ann.name;
NSLog(@"ann.name:%@", ann.name);
NSLog(@"details:%@", flipsideViewController.details);

FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"details" bundle:nil];
    controller.delegate = self;     
  controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:controller animated:YES];
    [controller release]; 

到

FlipsideViewController *flipsideViewController;
flipsideViewController=  [[FlipsideViewController alloc]init];
flipsideViewController.details =ann.name;
NSLog(@"ann.name:%@", ann.name);
NSLog(@"details:%@", flipsideViewController.details);

flipsideViewController.delegate = self;     
flipsideViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:flipsideViewController animated:YES];
[flipsideViewController release];

Answer 2

尝试这一步： - 1）首先在anotherViewController.h中创建属性

@property (nonatomic, strong ) NSString *fetchStr;

2）在anotherViewController.m中合成NSString

@synthesize fetchStr;

3）在firstViewController中使用

anotherViewController *avc =  [[anotherViewController alloc]init];
avc.fetchStr = ann.name;

并在另一个ViewController中打印（NSLog）fetchStr

Answer 3

制作注释

@property(nonatomic,retain) MyLocation *annotation;

然后将其传递给另一个视图控制器。

它会起作用。