我在视图控制器中有一个UITableView设置，用于填充函数返回的JSON数据。加载MatchCenterViewController时，应用程序崩溃，并且收到以下错误：
2014-06-07 15:56:23.651 Parse+Storyboard[6848:607] -[UIView tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0xaa29730
2014-06-07 15:56:23.825 Parse+Storyboard[6848:607] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0xaa29730'
*** First throw call stack:
(
0 CoreFoundation 0x02a8c1e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x0264a8e5 objc_exception_throw + 44
2 CoreFoundation 0x02b29243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x02a7c50b ___forwarding___ + 1019
4 CoreFoundation 0x02a7c0ee _CF_forwarding_prep_0 + 14
5 UIKit 0x0156f94c -[UISectionRowData refreshWithSection:tableView:tableViewRowData:] + 2510
6 UIKit 0x0157323d -[UITableViewRowData numberOfRows] + 98
7 UIKit 0x013f0df2 -[UITableView noteNumberOfRowsChanged] + 120
8 UIKit 0x013f07a5 -[UITableView reloadData] + 814
9 UIKit 0x013f43b3 -[UITableView _reloadDataIfNeeded] + 65
10 UIKit 0x013f95f4 -[UITableView layoutSubviews] + 36
11 UIKit 0x01379964 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
12 libobjc.A.dylib 0x0265c82b -[NSObject performSelector:withObject:] + 70
13 QuartzCore 0x0064f45a -[CALayer layoutSublayers] + 148
14 QuartzCore 0x00643244 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
15 QuartzCore 0x006430b0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
16 QuartzCore 0x005a97fa _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
17 QuartzCore 0x005aab85 _ZN2CA11Transaction6commitEv + 393
18 QuartzCore 0x006685b0 +[CATransaction flush] + 52
19 UIKit 0x013089bb _UIApplicationHandleEventQueue + 13095
20 CoreFoundation 0x02a1577f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
21 CoreFoundation 0x02a1510b __CFRunLoopDoSources0 + 235
22 CoreFoundation 0x02a321ae __CFRunLoopRun + 910
23 CoreFoundation 0x02a319d3 CFRunLoopRunSpecific + 467
24 CoreFoundation 0x02a317eb CFRunLoopRunInMode + 123
25 GraphicsServices 0x02ce95ee GSEventRunModal + 192
26 GraphicsServices 0x02ce942b GSEventRun + 104
27 UIKit 0x0130af9b UIApplicationMain + 1225
28 Parse+Storyboard 0x00002cbd main + 141
29 libdyld.dylib 0x038e56d9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我已经检查了错误代码所指的UIView tableView:numberOfRowsInSection，但我看不出是什么原因造成的，因为它只是告诉它有3行。代码和屏幕截图如下。
MatchCenterViewController.m：
#import "MatchCenterViewController.h"
#import <UIKit/UIKit.h>
@interface MatchCenterViewController () <UITableViewDataSource, UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *matchCenter;
@end
@implementation MatchCenterViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSDictionary *matchCenterDictionary= [self.matchCenterArray objectAtIndex:indexPath.row];
cell.textLabel.text = [matchCenterDictionary objectForKey:@"Title"];// title of the first object
// if([matchCenterDictionary objectForKey:@"Price"] != NULL)
// {
// cell.detailTextLabel.text = [NSString stringWithFormat:@"$%@",[matchCenterDictionary objectForKey:@"Price"]];
// }
return cell;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.matchCenterArray = [[NSArray alloc] init];
//perform search with criteria just submitted
[PFCloud callFunctionInBackground:@"MatchCenterTest"
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);
}
}];
}
- (void)viewDidAppear:(BOOL)animated
{
[PFCloud callFunctionInBackground:@"MatchCenterTest"
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);
}
}];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before 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
<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9MMnRiZi5wbmcifQ==” alt =“在此处输入图像描述”>
<< img src =“ https://image.soinside.com/eyJ1cmwiOiAiaHR0cHM6Ly9pLnN0YWNrLmltZ3VyLmNvbS9BWUJndy5wbmcifQ==” alt =“在此处输入图像描述”>
要在界面构建器中将tableView的UITableViewDelegate和UITableViewDataSource设置为UIView，而不是MatchCenterViewController。
[UIView没有实现UITableViewDataSource，这就是为什么您收到无法识别的选择器错误。
您需要将delegate和dataSource设置为实现委托方法的类。您的情况就是您的MatchCenterViewController。
[另外我注意到，您同时在PFCloud和viewDidLoad上都调用了viewDidAppear方法。您只应在一个位置执行此操作，如果要使其执行一个，则将其添加到viewDidLoad，如果要使其在每次显示view时执行，请将其添加到viewDidAppear。
还有另一件事：您应该按从上到下的顺序（在文件中）具有方法：
init，initWithFrame等）#pragma mark分隔。您需要将MatchCenterViewController类设置为dataSource并为matchCenter表视图委托。
在initWithNibName函数中添加以下两行代码
[matchCenter setDelegate：self];[matchCenter setDataSource：self];