Question

我想在网格视图中显示我的图像。我使用了UICollection视图控制器，我正在以JSON格式传递数据。我无法使用JSON格式显示图像。任何人都可以找到我的错误吗？这是我的代码

@interface ReceipeCollectionViewController()
{
    NSMutableData *webdata;
    NSURLConnection *connection;
    NSMutableArray *contentarray;
    NSMutableArray *array;
}

@end

@implementation ReceipeCollectionViewController

(void)viewDidLoad
{
    [super viewDidLoad];
    [array removeAllObjects];
    [[self collectionView]setDelegate:self];
    [[self collectionView]setDataSource:self];
    array = [[NSMutableArray alloc] init];     
}

(void)viewDidAppear:(BOOL)animated
{
    NSString *serverurl=@"http://wesotech.com/web/myrecipe/web_services/recipe_listing.php?";
    NSURL *url=[NSURL URLWithString:serverurl];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    connection = [NSURLConnection connectionWithRequest:request delegate:self];
    if(connection)
    {
        webdata=[[NSMutableData alloc]init];
    }
    else
    {
        NSLog(@"Connection failure");
    }
}

(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [webdata appendData:data];
}

(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"Fail with error");
}

(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSError *error;
    NSArray *results=[NSJSONSerialization JSONObjectWithData:webdata options:0 error:&error];
    [array removeAllObjects];
    [array addObjectsFromArray:results];
    [[self collectionView]reloadData];
}

(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [webdata setLength:0];
}

(void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}

(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return [array count];
}

(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    [self.mySpinner stopAnimating];

    static NSString *identifier = @"Cell";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    UIImageView *recipeImageView = (UIImageView *)[cell.contentView viewWithTag:100];

     recipeImageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[array objectAtIndex:indexPath.row] valueForKey:@"image"]]]];

    UITextField *recipeTitleView =(UITextField *)[cell.contentView viewWithTag:101];

    recipeTitleView.text=[[array objectAtIndex:indexPath.row]valueForKey:@"recname"];

    return cell;
}

@end

我的JSON格式是，

[

    {"image":"http:\/\/wesotech.com\/web\/myrecipe\/recipeimages\/2016080614704658059030.jpg","recname":"Italian Chicken","recid":"1"},
    {"image":"http:\/\/wesotech.com\/web\/myrecipe\/recipeimages\/2016080614704653421637.jpg","recname":"Fast Food Friday","recid":"2"},
    {"image":"http:\/\/wesotech.com\/web\/myrecipe\/recipeimages\/2016080614704648912893.jpg","recname":"Honey Clazed Lamb Chops","recid":"3"}

]

Answer 1

创建一个tableViewCell类，并将该类名分配给实用程序区域中collectionView的单元格。在tableViewCell类中创建imageView的出口，并在cellForItemAtIndexPath委托方法中访问它。然后使用以下代码分配图像：

[cell. recipeImageView sd_setImageWithURL:[NSURL URLWithString:[[array objectAtIndex:indexPath.row] valueForKey:@"image"]]];

这肯定会帮到你。

Answer 2

不要使用<?php $result = exec("perl test.pl &"); echo $result; header("Location: newpage.php") ; ?>转义您的网址，而是在您的JSON中使用百分比编码，并使用以下代码将其解码回未转义的字符串

另一个要点：由于您要使用NSString *imageUrl = @"http%3A%2F%2Fwesotech.com%2Fweb%2Fmyrecipe%2Frecipeimages%2F2016080614704658059030.jpg"; NSString *url = [imageUrl stringByRemovingPercentEncoding];加载图片，因此您应该在http://下的Allow Arbitrary Loads设置为YES {1}}文件。

另外，请注意，不建议设置允许任意加载，因为这会导致安全问题。如果你这样会更好   可以让您的所有网络电话都使用App Transport Security Settings

将Json值传递给UICollection视图

2 个答案: