Here's the issue: UITableViewController (with UITableView) and when there's no row, I would like to show a "No content" label above.
这里有一个问题:UITableViewController(使用UITableView)，当没有行时，我想显示上面的“无内容”标签。
It works on iOS 8.x but crashes (assertion failure) on iOS 7.1.
它适用于iOS 8。但在ios7.1上崩溃(断言失败)。
Assertion failure in -[UITableView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2935.137/UIView.m:8794
断言失败在-[UITableView layoutSublayersOfLayer:]， /SourceCache/UIKit_Sim/UIKit-2935.137/UIView.m:8794。
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. UITableView's implementation of -layoutSubviews needs to call super.'
终止应用程序由于未被捕获的异常“nsinternalinencyexception”，原因:在执行-layoutSubviews后仍然需要自动布局。UITableView的-layoutSubviews的实现需要调用super。
Full stack:
完整的堆栈:
*** Assertion failure in -[UITableView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2935.137/UIView.m:8794
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. UITableView's implementation of -layoutSubviews needs to call super.'
*** First throw call stack:
(
0 CoreFoundation 0x007fb1e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x0057a8e5 objc_exception_throw + 44
2 CoreFoundation 0x007fb048 +[NSException raise:format:arguments:] + 136
3 Foundation 0x0015a4de -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
4 UIKit 0x00cdea38 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 567
5 libobjc.A.dylib 0x0058c82b -[NSObject performSelector:withObject:] + 70
6 QuartzCore 0x044eb45a -[CALayer layoutSublayers] + 148
7 QuartzCore 0x044df244 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
8 QuartzCore 0x044eb3a5 -[CALayer layoutIfNeeded] + 160
9 UIKit 0x00da0ae3 -[UIViewController window:setupWithInterfaceOrientation:] + 304
10 UIKit 0x00cb6aa7 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 5212
11 UIKit 0x00cb5646 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
12 UIKit 0x00cb5518 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
13 UIKit 0x00cb55a0 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
14 UIKit 0x00cb463a __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
15 UIKit 0x00cb459c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
16 UIKit 0x00cb52f3 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
17 UIKit 0x00cb88e6 -[UIWindow setDelegate:] + 449
18 UIKit 0x00d92b77 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
19 UIKit 0x00cae474 -[UIWindow addRootViewControllerViewIfPossible] + 591
20 UIKit 0x00cae5ef -[UIWindow _setHidden:forced:] + 312
21 UIKit 0x00cae86b -[UIWindow _orderFrontWithoutMakingKey] + 49
22 UIKit 0x00cb93c8 -[UIWindow makeKeyAndVisible] + 65
23 tableviewtest 0x000eea0a -[AppDelegate application:didFinishLaunchingWithOptions:] + 554
24 UIKit 0x00c6914f -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 309
25 UIKit 0x00c69aa1 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1810
26 UIKit 0x00c6e667 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
27 UIKit 0x00c82f92 -[UIApplication handleEvent:withNewEvent:] + 3517
28 UIKit 0x00c83555 -[UIApplication sendEvent:] + 85
29 UIKit 0x00c70250 _UIApplicationHandleEvent + 683
30 GraphicsServices 0x02cc7f02 _PurpleEventCallback + 776
31 GraphicsServices 0x02cc7a0d PurpleEventCallback + 46
32 CoreFoundation 0x00776ca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
33 CoreFoundation 0x007769db __CFRunLoopDoSource1 + 523
34 CoreFoundation 0x007a168c __CFRunLoopRun + 2156
35 CoreFoundation 0x007a09d3 CFRunLoopRunSpecific + 467
36 CoreFoundation 0x007a07eb CFRunLoopRunInMode + 123
37 UIKit 0x00c6dd9c -[UIApplication _run] + 840
38 UIKit 0x00c6ff9b UIApplicationMain + 1225
39 tableviewtest 0x000eed4a main + 138
40 libdyld.dylib 0x028fa6d9 start + 1
41 ??? 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I made an example project where I don't use storyboard or nibs. (No Main.storyboard and removed the entry in Info.plist)
我做了一个示例项目，我不使用故事板或nib。(无主。故事板，并移除Info.plist中的条目。
Source code:
源代码:
AppDelegate.h
AppDelegate.h
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end
AppDelegate.m
AppDelegate.m
#import "AppDelegate.h"
#import "ViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
ViewController *viewController = [[ViewController alloc] init];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window setRootViewController:viewController];
[self.window makeKeyAndVisible];
return YES;
}
ViewController.h
ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UITableViewController
@end
ViewController.m
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
UILabel *centerLabel = [[UILabel alloc] initWithFrame:CGRectZero];
centerLabel.translatesAutoresizingMaskIntoConstraints = NO;
centerLabel.backgroundColor = [UIColor grayColor];
centerLabel.text = @"Hello World 42";
[self.view addSubview:centerLabel];
NSDictionary *subviews = NSDictionaryOfVariableBindings(centerLabel);
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[centerLabel(160)]"
options:0
metrics:nil
views:subviews]];
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[centerLabel(60)]"
options:0
metrics:nil
views:subviews]];
}
@end
Read this report and refactored my code to use MyTableView instance for the UITableViewController:
读取这个报告并重构我的代码以使用UITableViewController的MyTableView实例:
MyTableView.h
MyTableView.h
#import <UIKit/UIKit.h>
@interface MyTableView : UITableView
@end
MyTableView.m
MyTableView.m
#import "MyTableView.h"
@implementation MyTableView
- (void)layoutSublayersOfLayer:(CALayer *)layer
{
NSLog(@"layoutSublayersOfLayer:\n%@", [self performSelector:@selector(_autolayoutTrace) withObject:nil]); // compiler warning - ignore for this time
[super layoutSublayersOfLayer:layer];
}
@end
And overrode -UITableViewController loadView method like this:
重载-UITableViewController loadView方法:
- (void)loadView
{
MyTableView *tableView = [[MyTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
self.view = tableView;
self.tableView = tableView;
}
Here's the result under iOS 8.x:
这是iOS 8下的结果:
2015-07-10 13:04:41.987 tableviewtest[55866:13452767] layoutSublayersOfLayer:
UIWindow:0x7e06fa00
| •MyTableView:0x7db5ac00
| | UITableViewWrapperView:0x7db47200
| | *UILabel:0x7bcdb3f0'Hello World 42'- AMBIGUOUS LAYOUT for UILabel:0x7bcdb3f0'Hello World 42'.minX{id: 3}, UILabel:0x7bcdb3f0'Hello World 42'.minY{id: 8}
| | UIImageView:0x7bceab00
| | UIImageView:0x7bceb9a0
2015-07-10 13:04:41.988 tableviewtest[55866:13452767] layoutSublayersOfLayer:
UIWindow:0x7e06fa00
| •MyTableView:0x7db5ac00
| | UITableViewWrapperView:0x7db47200
| | *UILabel:0x7bcdb3f0'Hello World 42'
| | UIImageView:0x7bceab00
| | UIImageView:0x7bceb9a0
![断言失败——[UITableView layoutSublayersOfLayer:]在ios7上。](https://image.shishitao.com:8440/aHR0cHM6Ly93d3cuaXRkYWFuLmNvbS9nby9hSFIwY0hNNkx5OXBMbk4wWVdOckxtbHRaM1Z5TG1OdmJTOXhXa1pQUlM1d2JtYz0%3D.jpg?w=700&webp=1 "断言失败——[UITableView layoutSublayersOfLayer:]在ios7上。")
Here's the result under iOS 7.1:
这是iOS 7.1下的结果:
2015-07-10 13:02:47.912 tableviewtest[55803:607] layoutSublayersOfLayer:
*<UIWindow:0x7ae63e70>
| *<MyTableView:0x7c221000>
| | <UITableViewWrapperView:0x7b048610>
| | *<UILabel:0x7b046f20>
| | <UIImageView:0x7b076280>
| | <UIImageView:0x7b079c00>
2015-07-10 13:06:27.886 tableviewtest[55911:607] *** Assertion failure in -[MyTableView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2935.137/UIView.m:8794
2015-07-10 13:06:27.889 tableviewtest[55911:607] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. MyTableView's implementation of -layoutSubviews needs to call super.'
...
Based on this report I also tried to set
在这份报告的基础上，我也尝试了设置。
centerLabel.translatesAutoresizingMaskIntoConstraints = YES;
but in that case I have no visible label (because of a conflict and there's no contentView of UITableViewController like on a UITableViewCell).
但在这种情况下，我没有可见的标签(因为有冲突，而且UITableViewCell上没有UITableViewController的contentView)。
Does anybody have a solution for this issue?
有人能解决这个问题吗?
Thank you,
谢谢你！
Adam
亚当
P.S.: Sorry for the long post
注:很抱歉这么长的帖子。
1 个解决方案
#1
4
in iOS7, table view could not add a subview. A view of the tableViewController is the table view
在iOS7中，表视图不能添加子视图。tableViewController的视图是表视图。
#1
4
in iOS7, table view could not add a subview. A view of the tableViewController is the table view
在iOS7中，表视图不能添加子视图。tableViewController的视图是表视图。