从多个不同的视图控制器调用的单个弹出窗口，除了一个特定的视图控制器外没有问题。所有视图控制器都来自同一个父类，因此使用相同的函数来显示弹出窗口。该函数使用presentPopoverFromRect来显示有问题的popover。在问题视图控制器上，我可以看到弹出窗口viewDidLoad触发，然后应用程序崩溃并出现无效的参数异常。我不知道UILabel在谈论什么，或者为什么要试图获得它的长度。
-(IBAction) showNormSelector:(id)sender
{
if (self.normSelectionPopover == nil)
{
Ace_Metrix_iPad_2AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
UIStoryboard* storyBoard = [UIStoryboard storyboardWithName:@"AceMetrixMOBILEHD_Storyboard" bundle:[NSBundle mainBundle]];
NSMutableDictionary* mdic = [[NSMutableDictionary alloc]initWithCapacity:4];
mdic[NSLocalizedStringFromTable(@"Industry", appDelegate.stringTableName,@"")] = @(IndustryType);
mdic[NSLocalizedStringFromTable(@"Category", appDelegate.stringTableName,@"")] = @(CategoryType);
mdic[NSLocalizedStringFromTable(@"Subcategory", appDelegate.stringTableName,@"")] = @(SubCategoryType);
mdic[NSLocalizedStringFromTable(@"Brand", appDelegate.stringTableName,@"")] = @(BrandType);
NSArray* arr = @[NSLocalizedStringFromTable(@"Industry", appDelegate.stringTableName,@""),
NSLocalizedStringFromTable(@"Category", appDelegate.stringTableName,@""),
NSLocalizedStringFromTable(@"Subcategory", appDelegate.stringTableName,@""),
NSLocalizedStringFromTable(@"Brand", appDelegate.stringTableName,@"")];
self.popOver = (SelectorPopover*)[storyBoard instantiateViewControllerWithIdentifier:@"NormTypeSelector"];
[self.popOver setSelectionText:mdic];
[self.popOver setAllKeys:[NSMutableArray arrayWithArray:arr]];
[self.popOver setDelegate:self];
self.normSelectionPopover = [[UIPopoverController alloc] initWithContentViewController:self.popOver];
}
[self.popOver setCurrentSel:@(self.normType)];
[self.popOver.tableView reloadData];
[self.normSelectionPopover presentPopoverFromRect:self.normButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
SelectorPopover.m
@implementation SelectorPopover
@synthesize delegate;
@synthesize selectionText;
@synthesize allKeys;
@synthesize tag;
@synthesize currentSel;
-(void) viewDidLoad {
[super viewDidLoad];
self.clearsSelectionOnViewWillAppear = NO;
if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7) // before iOS 7
{
self.contentSizeForViewInPopover = CGSizeMake(135, [self.tableView rowHeight] * 4); // Depricated in iOS 7
}
else
{
self.preferredContentSize = CGSizeMake(135, [self.tableView rowHeight] * 4);
}
NSUInteger newIndex[] = {0, 0};
NSIndexPath* indexPath = [[NSIndexPath alloc] initWithIndexes:newIndex length:2];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition: UITableViewScrollPositionNone];
}
/*
-(void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
*/
/*
-(void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
*/
/*
-(void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
-(void) viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation // Deprecated in iOS6
{
if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight)
return YES;
return NO;
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskLandscape;
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [self.selectionText count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"SelectCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
NSString* method = self.allKeys[indexPath.row];
cell.textLabel.text = method;
[cell.textLabel setTextColor:AMColorNeutralMidGrey38];
cell.accessoryType = UITableViewCellAccessoryNone;
cell.accessoryView = nil;
NSNumber* uuid = (self.selectionText)[method];
if ([self.currentSel integerValue] == [uuid integerValue])
{
UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"checkmark_blue.png"]];
cell.accessoryView = checkmark;
[cell.textLabel setTextColor:AMColorTradeMarkLightBlue];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
-(void) tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
-(void) tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Table view delegate
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (self.delegate)
{
NSString* key = self.allKeys[indexPath.row];
NSNumber* value = (NSNumber*) (self.selectionText)[key];
[self.delegate itemSelected:[value integerValue]];
}
}
#pragma mark -
#pragma mark Memory management
-(void) didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc. that aren't in use.
}
-(void) viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
[super viewDidUnload];
}
-(void) dealloc {
self.delegate = nil;
}
@end
SelectorPopover.h
@protocol ItemSelectdDelegate
-(void)itemSelected:(HierarchyType) item;
@end
@interface SelectorPopover : UITableViewController
@property (nonatomic, weak) id<ItemSelectdDelegate> delegate;
@property (nonatomic,strong) NSMutableDictionary* selectionText;
@property (nonatomic,strong) NSMutableArray* allKeys;
@property (nonatomic,strong) NSNumber* currentSel;
@property (nonatomic) NSInteger tag;
@end
调用堆栈：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILabel length]: unrecognized selector sent to instance 0x7b60bd30'
*** First throw call stack:
(
0 CoreFoundation 0x03b49df6 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x02f52a97 objc_exception_throw + 44
2 CoreFoundation 0x03b51a75 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x03a9a9c7 ___forwarding___ + 1047
4 CoreFoundation 0x03a9a58e _CF_forwarding_prep_0 + 14
5 CoreFoundation 0x03a33306 CFStringAppend + 374
6 CoreFoundation 0x03a30e2a __CFStringAppendFormatCore + 11754
7 CoreFoundation 0x03b26aa5 _CFStringCreateWithFormatAndArgumentsAux2 + 245
8 Foundation 0x004e9377 -[NSPlaceholderString initWithFormat:locale:arguments:] + 159
9 Foundation 0x004ecc22 +[NSString stringWithFormat:] + 89
10 UIKit 0x00aaa7a4 -[UIViewController _presentViewController:withAnimationController:completion:] + 2825
11 UIKit 0x00aad032 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 345
12 UIKit 0x00aace84 -[UIViewController presentViewController:animated:completion:] + 224
13 UIKit 0x01019011 -[UIPopoverController _presentShimmedPopoverFromRect:inView:permittedArrowDirections:animated:] + 217
14 UIKit 0x01019211 -[UIPopoverController presentPopoverFromRect:inView:permittedArrowDirections:animated:] + 355
15 Ace Metrix MOBILE HD 0x00111242 -[AdDetailViewController showNormSelector:] + 3762
16 libobjc.A.dylib 0x02f687cd -[NSObject performSelector:withObject:withObject:] + 84
17 UIKit 0x0094779d -[UIApplication sendAction:to:from:forEvent:] + 99
18 UIKit 0x0094772f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
19 UIKit 0x00a7aa16 -[UIControl sendAction:to:forEvent:] + 69
20 UIKit 0x00a7ae33 -[UIControl _sendActionsForEvents:withEvent:] + 598
21 UIKit 0x00a7a09d -[UIControl touchesEnded:withEvent:] + 660
22 UIKit 0x00d7e257 _UIGestureRecognizerUpdate + 13225
23 UIKit 0x0099771b -[UIWindow _sendGesturesForEvent:] + 1356
24 UIKit 0x0099857f -[UIWindow sendEvent:] + 769
25 UIKit 0x0095daa9 -[UIApplication sendEvent:] + 242
26 UIKit 0x0096d8de _UIApplicationHandleEventFromQueueEvent + 20690
27 UIKit 0x00942079 _UIApplicationHandleEventQueue + 2206
28 CoreFoundation 0x03a6d7bf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
29 CoreFoundation 0x03a632cd __CFRunLoopDoSources0 + 253
30 CoreFoundation 0x03a62828 __CFRunLoopRun + 952
31 CoreFoundation 0x03a621ab CFRunLoopRunSpecific + 443
32 CoreFoundation 0x03a61fdb CFRunLoopRunInMode + 123
33 GraphicsServices 0x04b5a24f GSEventRunModal + 192
34 GraphicsServices 0x04b5a08c GSEventRun + 104
35 UIKit 0x00945e16 UIApplicationMain + 1526
36 Ace Metrix MOBILE HD 0x00006cad main + 141
37 libdyld.dylib 0x03541ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
答案 0 :(得分：0)
我认为你正在做某个地方[标签长度]而不是[label.text length]