My Parse云代码使用以下结构将JSON发送回我的iOS应用程序:
我想要做的就是遍历这个并在UITableView中为这个matchCenterArray
中的每个对象创建一个新的部分。
在这个例子中,数组中有三个对象,每个对象包含一个Top 3
NSDictionary,其值为3个项目的数组,每个项目都是另一个属性数组。正如您所看到的,我希望它设置为每个部分有3个单元格,每个单元格对应相应matchCenterArray
个对象的前三个项目。然后,我希望它拉出每个项目的属性,并在每个单元格中显示为texLabel
,detailTextLabel
和缩略图。
我尝试使用for循环作为解决方案,但这会在数组的所有单元格中显示相同的项目。这可能是因为我只是循环遍历matchCenterArray对象,而不是另外循环遍历这些对象中的项目,如下所示:
cell.textLabel.text = [[[[_matchCenterArray objectAtIndex:i] objectForKey:@"Top 3"] objectAtIndex:0]objectForKey:@"Title"];
我想要做的是将for循环嵌套在这个循环中,代替objectAtIndex:0
,但是向for循环发送消息并不起作用。
MatchCenterViewController.m:
#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-100);
_matchCenter.dataSource = self;
_matchCenter.delegate = self;
[self.view addSubview:self.matchCenter];
_matchCenterArray = [[NSArray alloc] init];
}
- (void)viewDidAppear:(BOOL)animated
{
self.matchCenterArray = [[NSArray alloc] init];
[PFCloud callFunctionInBackground:@"MatchCenterTest"
withParameters:@{
@"test": @"Hi",
}
block:^(NSArray *result, NSError *error) {
if (!error) {
_matchCenterArray = result;
[_matchCenter reloadData];
NSLog(@"Result: '%@'", result);
}
}];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return _matchCenterArray.count;
}
//the part where i setup sections and the deleting of said sections
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
return 21.0f;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 21)];
headerView.backgroundColor = [UIColor lightGrayColor];
// _searchTerm = [[self.matchCenterArray firstObject] objectForKey:@"Search Term"];
UILabel *headerLabel = [[UILabel alloc] initWithFrame:CGRectMake(8, 0, 250, 21)];
// headerLabel.text = [NSString stringWithFormat:@"%@", searchTerm];
// headerLabel.font = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
// headerLabel.textColor = [UIColor whiteColor];
headerLabel.backgroundColor = [UIColor lightGrayColor];
[headerView addSubview:headerLabel];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.tag = section + 1000;
button.frame = CGRectMake(300, 2, 17, 17);
[button setImage:[UIImage imageNamed:@"xbutton.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(deleteButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[headerView addSubview:button];
return headerView;
}
- (IBAction)deleteButtonPressed:(UIButton *)sender {
NSLog(@"Search Term: '%@'", _searchTerm);
[PFCloud callFunctionInBackground:@"deleteFromMatchCenter"
withParameters:@{
@"searchTerm": _searchTerm,
}
block:^(NSDictionary *result, NSError *error) {
if (!error) {
NSLog(@"Result: '%@'", result);
}
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (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];
}
for (int i = 0; i<[_matchCenterArray count]; i++) {
// populate dictionary with results
//NSDictionary *matchCenterDictionary= [_matchCenterArray objectAtIndex:indexPath.row];
// title of the item
cell.textLabel.text = [[[[_matchCenterArray objectAtIndex:i] objectForKey:@"Top 3"] objectAtIndex:0]objectForKey:@"Title"];
cell.textLabel.font = [UIFont boldSystemFontOfSize:12];
// price of the item
cell.detailTextLabel.text = [NSString stringWithFormat:@"$%@", [[[[_matchCenterArray objectAtIndex:i] objectForKey:@"Top 3"] objectAtIndex:0]objectForKey:@"Price"]];
cell.detailTextLabel.textColor = [UIColor colorWithRed:0/255.0f green:127/255.0f blue:31/255.0f alpha:1.0f];
// image of the item
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[[[_matchCenterArray objectAtIndex:i] objectForKey:@"Top 3"] objectAtIndex:0] objectForKey:@"Image URL"]]];
[[cell imageView] setImage:[UIImage imageWithData:imageData]];
//imageView.frame = CGRectMake(45.0,10.0,10,10);
}
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
答案 0 :(得分:1)
忘记循环,委托方法已在迭代编号等于数据源计数的循环上运行。
<强> numberOfSectionsInTableView 强>
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return _matchCenterArray.count;
}
<强> numberOfRowsInSection 强>
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section{
return _matchCenterArray[section][@"Top 3"].count;
}
<强>的cellForRowAtIndexPath 强>
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath{
// Initialize cell
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!cell) {
// if no cell could be dequeued create a new one
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:CellIdentifier];
}
// title of the item
cell.textLabel.text = _matchCenterArray[indexPath.section][@"Top 3"][indexPath.row][@"Title"];
cell.textLabel.font = [UIFont boldSystemFontOfSize:12];
// price of the item
cell.detailTextLabel.text = [NSString stringWithFormat:@"$%@", _matchCenterArray[indexPath.section][@"Top 3"][indexPath.row][@"Price"];
cell.detailTextLabel.textColor = [UIColor colorWithRed:0/255.0f green:127/255.0f blue:31/255.0f alpha:1.0f];
// image of the item
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:_matchCenterArray[indexPath.section][@"Top 3"][indexPath.row][@"Image URL"]]];
[[cell imageView] setImage:[UIImage imageWithData:imageData]];
return cell;
}
答案 1 :(得分:0)
cellForRowAtIndexPath:
调用{p> numberOfRowsInSection:
一次
您还需要添加numberOfSections
:
它应该是这样的:
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 3;
}
- (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];
}
// the following will set the cell attributes for cells in each section
// to customize per section, use indexPath.section to get which section you are at
// title of the item
cell.textLabel.text = [[[[_matchCenterArray objectAtIndex:indexPath.row objectForKey:@"Top 3"] objectAtIndex:0]objectForKey:@"Title"];
cell.textLabel.font = [UIFont boldSystemFontOfSize:12];
// price of the item
cell.detailTextLabel.text = [NSString stringWithFormat:@"$%@", [[[[_matchCenterArray objectAtIndex:indexPath.row] objectForKey:@"Top 3"] objectAtIndex:0]objectForKey:@"Price"]];
cell.detailTextLabel.textColor = [UIColor colorWithRed:0/255.0f green:127/255.0f blue:31/255.0f alpha:1.0f];
// image of the item
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[[[_matchCenterArray objectAtIndex:indexPath.row] objectForKey:@"Top 3"] objectAtIndex:0] objectForKey:@"Image URL"]]];
[[cell imageView] setImage:[UIImage imageWithData:imageData]];
return cell;
}