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我解析了將JSON返回給我的iOS應用程序的雲代碼。從下面的JSON中可以看出，每個項目都有一個Image URL屬性。我想要做的是將每個UITableViewCell的縮略圖設置爲該項目各自的Image URL。如何顯示以JSON形式返回的圖像URL，作爲UITableViewCell的縮略圖
我知道這涉及到處理異步行爲，因此單元必須等待圖像加載後再顯示它們。我一直在搜索如何完成這項任務，而且我無法理解如何去做。
我下面用
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL [*matchCenterDictionary objectForKey:@"Image URL"]]];
[[cell imageView] setImage:[UIImage imageWithData:imageData]];
試圖給我的錯誤，說明expected identifier。
MatchCenterViewController.m：返回
#import "MatchCenterViewController.h"
#import <UIKit/UIKit.h>
@interface MatchCenterViewController() <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) UITableView *matchCenter;
@end
@implementation MatchCenterViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.matchCenter = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewCellStyleSubtitle];
self.matchCenter.frame = CGRectMake(0,50,320,self.view.frame.size.height-200);
_matchCenter.dataSource = self;
_matchCenter.delegate = self;
[self.view addSubview:self.matchCenter];
self.matchCenterArray = [[NSArray alloc] init];
}
- (void)viewDidAppear:(BOOL)animated
{
self.matchCenterArray = [[NSArray alloc] init];
[PFCloud callFunctionInBackground:@"MatchCenter"
withParameters:@{
@"test": @"Hi",
}
block:^(NSDictionary *result, NSError *error) {
if (!error) {
self.matchCenterArray = [result objectForKey:@"Top 3"];
dispatch_async(dispatch_get_main_queue(), ^{
[_matchCenter reloadData];
});
NSLog(@"Test Result: '%@'", result);
}
}];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.matchCenterArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Initialize cell
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
// if no cell could be dequeued create a new one
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
// populate dictionary with results
NSDictionary *matchCenterDictionary= [self.matchCenterArray objectAtIndex:indexPath.row];
// title of the item
cell.textLabel.text = [matchCenterDictionary objectForKey:@"Title"];
// price of the item
cell.detailTextLabel.text = [matchCenterDictionary objectForKey:@"Price"];
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL [*matchCenterDictionary objectForKey:@"Image URL"]]];
[[cell imageView] setImage:[UIImage imageWithData:imageData]];
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
JSON：
{
"Top 3" = (
{
"Image URL" = "http://thumbs1.ebaystatic.com/m/m43q-_-W_kKrSuwWbIO7msg/140.jpg";
"Item URL" = "http://www.ebay.com/itm/New-AT-T-Moto-X-XT1058-Android-Smartphone-Black-16GB-/141304035108?pt=Cell_Phones";
Price = "289.95";
Title = "New AT&T Moto X XT1058 Android Smartphone Black 16GB";
},
{
"Image URL" = "http://thumbs2.ebaystatic.com/m/mP5Gx55JuDEVZlmFodzuUow/140.jpg";
"Item URL" = "http://www.ebay.com/itm/New-AT-T-Moto-X-XT1058-Android-Smartphone-White-16GB-/141302889485?pt=Cell_Phones";
Price = "289.95";
Title = "New AT&T Moto X XT1058 Android Smartphone White 16GB";
},
{
"Image URL" = "http://thumbs2.ebaystatic.com/m/mDMiorn4BLSRBcU1EpbFPaA/140.jpg";
"Item URL" = "http://www.ebay.com/itm/New-Motorola-Moto-X-16GB-White-10MP-AT-T-Branded-Unlocked-Android-Smartphone-/131194435025?pt=Cell_Phones";
Price = "339.99";
Title = "New Motorola Moto X 16GB White 10MP AT&T Branded Unlocked Android Smartphone";
}
);
}