我想从JSON URL获取图像，所以我需要在图像列表中使用JSON数组和JSON对象才能在Image View中显示，但是我从JSON获取JSON数组时遇到了一些错误。
JSON：
{
"status": "200",
"requestType": "bannerImages",
"basePath": "http:\/\/192.168.0.33\/cartwebsite3\/",
"bannerPath": "http:\/\/192.168.0.33\/cartwebsite3\/cdn-images\/banner\/",
"response": {
"data": [
{
"banner_id": "37",
"banner_name": "1457324300894ac3df08bd3648452703d8412f82c2.jpg",
"banner_link": "",
"banner_blocked": "0",
"banner_created": "admin",
"created_on": "1457324300"
},
{
"banner_id": "36",
"banner_name": "14573242986be953c24858a3c2d787d57e6b77be1f.jpg",
"banner_link": "",
"banner_blocked": "0",
"banner_created": "admin",
"created_on": "1457324298"
},
{
"banner_id": "35",
"banner_name": "1457324295f8d8153fb4f29d3af15276db22435d48.jpg",
"banner_link": "",
"banner_blocked": "0",
"banner_created": "admin",
"created_on": "1457324295"
}
]
},
"request": {
"postData": [],
"getData": {
"type": "bannerImages",
"result": "json"
}
}
}
CODE：
#import "ViewController.h"
#import "TableViewCell.h"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
#define kLatestKivaLoansURL [NSURL URLWithString:@"http://192.168.0.33/cartwebsite3/qcrest1.0/?type=bannerImages&result=json"]
@interface ViewController ()
{
NSMutableArray *bannerPath_NameArr,*finalout;
NSString *jsonString;
NSArray *array;
NSString *arr1;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
statusarray=[[NSMutableArray alloc]init];
dispatch_async(kBgQueue, ^{ NSData *data=[NSData dataWithContentsOfURL:kLatestKivaLoansURL];
[self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];
});
}
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
return self.contentview;
}
-(void)fetchedData:(NSData *)responseData
{
NSError *error;
NSDictionary *json=[NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSMutableArray * outstatus = [json objectForKey:@"status"];
NSLog(@"status %@", outstatus);
jsonString = [jsonString stringByReplacingOccurrencesOfString:@"(\n" withString:@""];
array = [[json objectForKey:@"response"]valueForKey:@"data"];
NSString *arr3=[json objectForKey:@"bannerPath"];
NSLog(@"%@",arr3);
NSString *arr2=[json objectForKey:@"basePath"];
NSLog(@"%@",arr2);
[statusarray addObject:outstatus];
[ban_path_arr addObject:arr3];
[ban_base_arr addObject:arr2];
NSDictionary *jsondic=[json valueForKeyPath:@"response.data"];
// array = [[json objectForKey:@"response"] valueForKey:@"data"];
NSArray *banname=[jsondic valueForKey:@"banner_name"];
NSString *arr1=[json objectForKey:@"bannerPath"];
array = [[json objectForKey:@"response"] valueForKey:@"data"];
// for (int i=0; i<[banname count]; i++) {
// NSArray *test=[banname objectAtIndex:i];
// NSLog(@"%@",test);
// imageURL = [NSString stringWithFormat:@"%@%@",arr3,test];
// NSLog(@"URL= %@",imageURL);
//
// }
finalout=[[NSMutableArray alloc]init];
[finalout addObject:imageURL];
NSLog(@"array output %@",finalout);
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [finalout count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MyIdentifier = @"TableViewCell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier forIndexPath:indexPath];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"TableViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
NSString *UrlFormat = [NSString stringWithFormat:@"%@%@",arr1,[[array objectAtIndex:indexPath.row] valueForKey:@"banner_name"]];
NSLog(@"%@",UrlFormat);
NSData *imageurl=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:[finalout objectAtIndex:indexPath.row]]];
cell.imgName.image=[UIImage imageWithData:imageurl];
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
记录错误：
2016-05-05 17:40:21.578 pageview[2302:151094] status 200
2016-05-05 17:40:21.579 pageview[2302:151094] http://192.168.0.33/cartwebsite3/cdn-images/banner/
2016-05-05 17:40:21.579 pageview[2302:151094] http://192.168.0.33/cartwebsite3/
2016-05-05 17:40:21.597 pageview[2302:151094] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(
0 CoreFoundation 0x000000010d9b1e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010d42adeb objc_exception_throw + 48
2 CoreFoundation 0x000000010d8788c5 -[__NSArrayM insertObject:atIndex:] + 901
3 pageview 0x000000010cf168e0 -[ViewController fetchedData:] + 976
4 Foundation 0x000000010d013067 __NSThreadPerformPerform + 283
5 CoreFoundation 0x000000010d8dda31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
6 CoreFoundation 0x000000010d8d395c __CFRunLoopDoSources0 + 556
7 CoreFoundation 0x000000010d8d2e13 __CFRunLoopRun + 867
8 CoreFoundation 0x000000010d8d2828 CFRunLoopRunSpecific + 488
9 GraphicsServices 0x00000001120b5ad2 GSEventRunModal + 161
10 UIKit 0x000000010df86610 UIApplicationMain + 171
11 pageview 0x000000010cf1afdf main + 111
12 libdyld.dylib 0x000000011031592d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
我在for循环中遇到错误，我不知道如何通过使用for循环来转换JSON数组以获取图像视图中的所有图像。
我该如何解决这个问题。很高兴能够帮助他们。
答案 0 :(得分：0)
尝试此代码，它将帮助您获取图像
NSString *myImage = [imageArray objectAtIndex:indexPath.row];
NSURL *url = [NSURL URLWithString: images];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *image = [UIImage imageWithData:data];
cell. imgview.image = [UIImage imageNamed:img];
答案 1 :(得分：0)
使用此代码，
声明变量：
@interface ListViewController () {
NSString *arr1;
}
@end
获取方法：
-(void)fetchedData:(NSData *)responseData
{
NSError *error;
NSDictionary *json=[NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSMutableArray * outstatus = [json objectForKey:@"status"];
NSLog(@"status %@", outstatus);
arr1=[json objectForKey:@"bannerPath"];
finalout = [[json objectForKey:@"response"]valueForKey:@"data"];
NSLog(@"print %@", finalout);
// if you get the value its working fine.
[tableviewname reloadData];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [finalout count];
}
如果所有数据值都存储在数组中，那么
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MyIdentifier = @"TableViewCell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier forIndexPath:indexPath];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"TableViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
NSString UrlFormat = [NSString stringWithFormat:@"%@%@",arr1,[[array objectAtIndex:indexPath.row] valueForKey:@"banner_name"]];
NSData *imageurl=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:UrlFormat]];
cell.imgName.image=[UIImage imageWithData:imageurl];
return cell;
}
更改源代码中的上述代码，请更改方法 fetchedData 希望其有用
答案 2 :(得分：0)
请检查您的＆＃34; finalout＆＃34;数组不包含索引方面的正确数据。数组不能以正确的格式获取数据。你应该使用for循环并逐个存储＆＃34; finalout＆＃34;阵列。