我为UITableView设置了自定义UILabel标题，另一个设置为副标题，以便将文字对齐。
我的数据来自网络服务，我将其解析并存储在NSArray的{{1}}中。
一些标题或副标题可以是零/空文本。
为此，我将它放入try / catch。
我的桌子中的一条线让我的应用程序粉碎，我无法弄清楚原因。
我认为其中一个（标题/副标题）返回NSDictionary但是我为我的对象制作了一个日志打印类，对于我的NSDictionary，似乎一切正常。
异常和堆栈跟踪：
[UILabel text]相关代码：
2014-04-29 10:47:55.985 Cellular Radar[3226:60b] -[__NSDictionaryI length]: unrecognized selector sent to instance 0x16d007f0
2014-04-29 10:47:55.993 Cellular Radar[3226:60b] -[Home tableView:willDisplayCell:forRowAtIndexPath:], exception.reason: -[__NSDictionaryI length]: unrecognized selector sent to instance 0x16d007f0
2014-04-29 10:47:55.999 Cellular Radar[3226:60b] -[__NSDictionaryI length]: unrecognized selector sent to instance 0x16d007f0
2014-04-29 10:47:56.006 Cellular Radar[3226:60b] CRASH:
-[__NSDictionaryI length]: unrecognized selector sent to instance 0x16d007f0
2014-04-29 10:47:56.062 Cellular Radar[3226:60b] Stack Trace:
(
0 CoreFoundation 0x30e02feb <redacted> + 154
1 libobjc.A.dylib 0x3b5b1ccf objc_exception_throw + 38
2 CoreFoundation 0x30e06967 <redacted> + 202
3 CoreFoundation 0x30e05253 <redacted> + 706
4 CoreFoundation 0x30d547b8 _CF_forwarding_prep_0 + 24
5 UIKit 0x33637ed3 <redacted> + 38
6 UIKit 0x337595bb <redacted> + 3682
7 UIKit 0x33758031 <redacted> + 60
8 UIKit 0x3361ed79 <redacted> + 380
9 QuartzCore 0x3329c62b <redacted> + 142
10 QuartzCore 0x33297e3b <redacted> + 350
11 QuartzCore 0x33297ccd <redacted> + 16
12 QuartzCore 0x332976df <redacted> + 230
13 QuartzCore 0x332974ef <redacted> + 314
14 QuartzCore 0x332eac49 <redacted> + 516
15 IOMobileFramebuffer 0x3606375d <redacted> + 104
16 IOKit 0x31aed451 IODispatchCalloutFromCFMessage + 248
17 CoreFoundation 0x30dc2ef9 <redacted> + 136
18 CoreFoundation 0x30dcdab7 <redacted> + 34
19 CoreFoundation 0x30dcda53 <redacted> + 346
20 CoreFoundation 0x30dcc227 <redacted> + 1398
21 CoreFoundation 0x30d36f0f CFRunLoopRunSpecific + 522
22 CoreFoundation 0x30d36cf3 CFRunLoopRunInMode + 106
23 GraphicsServices 0x35c3b663 GSEventRunModal + 138
24 UIKit 0x3368216d UIApplicationMain + 1136
25 Cellular Radar 0x00077757 main + 70
26 libdyld.dylib 0x3babeab7 <redacted> + 2
)
2014-04-29 10:47:56.075 Cellular Radar[3226:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI length]: unrecognized selector sent to instance 0x16d007f0'
*** First throw call stack:
(0x30e02fd3 0x3b5b1ccf 0x30e06967 0x30e05253 0x30d547b8 0x33637ed3 0x337595bb 0x33758031 0x3361ed79 0x3329c62b 0x33297e3b 0x33297ccd 0x332976df 0x332974ef 0x332eac49 0x3606375d 0x31aed451 0x30dc2ef9 0x30dcdab7 0x30dcda53 0x30dcc227 0x30d36f0f 0x30d36cf3 0x35c3b663 0x3368216d 0x77757 0x3babeab7)
libc++abi.dylib: terminating with uncaught exception of type NSException
编辑 - 1：
我为我的NSDictionary创建了一个日志，因为@sleepwalkerfx指出了我的行压缩的结果是：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
tableView.separatorColor = [UIColor lightGrayColor];
UILabel *textLabel = (UILabel*)[cell viewWithTag:kTAG_TITLE];
UILabel *detailTextLabel = (UILabel*)[cell viewWithTag:kTAG_SUBTITLE];
UIImageView *imageView = (UIImageView*)[cell viewWithTag:kTAG_IMAGE];
textLabel.frame = CGRectMake(
textLabel.frame.origin.x,
textLabel.frame.origin.y - 10,
textLabel.frame.size.width,
textLabel.frame.size.height
);
cell.textLabel.frame = textLabel.frame;
cell.tag = indexPath.row;
cell.backgroundColor = [UIColor whiteColor];
cell.textLabel.font = cell.detailTextLabel.font = [UIFont fontWithName:kFONT_NAME size:kFONT_SIZE];
imageView.layer.cornerRadius = 10.0;
imageView.layer.borderColor = (__bridge CGColorRef)([UIColor clearColor]);
imageView.layer.borderWidth = 0;
imageView.clipsToBounds = YES;
imageView.contentMode = UIViewContentModeScaleAspectFill;
textLabel.text = @"";
textLabel.textColor = [UIColor darkGrayColor];
textLabel.backgroundColor = [UIColor clearColor];
textLabel.textAlignment = NSTextAlignmentRight;
textLabel.font = [UIFont fontWithName:kFONT_NAME size:kFONT_SIZE];
textLabel.textColor = [UIColor darkGrayColor];
detailTextLabel.text = @"";
detailTextLabel.font = [UIFont fontWithName:kFONT_NAME size:kFONT_SIZE];
detailTextLabel.backgroundColor = [UIColor clearColor];
detailTextLabel.textAlignment = NSTextAlignmentRight;
detailTextLabel.textColor = [UIColor darkGrayColor];
if (self.arrayGlobal.count > 0)
{
NSDictionary *dict = self.arrayGlobal[indexPath.row];
NSString *imageUrl = dict[@"imageUrl"];
@try
{
cell.textLabel.text = dict[@"Title"];
}
@catch (NSException *exception)
{
NSLog(@"%s, %@", __PRETTY_FUNCTION__, exception.reason);
cell.textLabel.text = @"";
}
@try
{
detailTextLabel.text = dict[@"Text"];
}
@catch (NSException *exception)
{
detailTextLabel.text = @"";
}
if (imageUrl.length > 0)
{
NSString *completeURL = @"";
completeURL = [completeURL stringByAppendingString:kPROFILE_IMAGE_URL];
completeURL = [completeURL stringByAppendingString:@"/2/"];
completeURL = [completeURL stringByAppendingString:imageUrl];
completeURL = [completeURL stringByAppendingString:@".png"];
NSString *fileName = [NSString stringWithFormat:@"%@.png", imageUrl];
NSString* path = GetMediaFolder();
BOOL imageExists = [[NSFileManager defaultManager] fileExistsAtPath:[path stringByAppendingPathComponent:fileName]];
if (imageExists)
{
dispatch_async(dispatch_get_main_queue(), ^{
UITableViewCell *updateCell = (id)[tableView cellForRowAtIndexPath:indexPath];
UIImageView *imageView = (UIImageView*)[updateCell viewWithTag:kTAG_IMAGE];
imageView.image=[UIImage imageWithContentsOfFile:[path stringByAppendingPathComponent:fileName]];
imageView.layer.cornerRadius = 23.0;
imageView.layer.borderColor = (__bridge CGColorRef)([UIColor clearColor]);
imageView.layer.borderWidth = 1.0;
imageView.clipsToBounds = YES;
imageView.contentMode = UIViewContentModeScaleAspectFill;
[updateCell setNeedsLayout];
});
}
else
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSURL *imageURL=[NSURL URLWithString:completeURL];
NSData *image=[NSData dataWithContentsOfURL:imageURL];
[image writeToFile:[path stringByAppendingPathComponent:fileName] atomically:YES];
// Update UI
dispatch_async(dispatch_get_main_queue(), ^{
UITableViewCell *updateCell = (id)[tableView cellForRowAtIndexPath:indexPath];
UIImageView *imageView = (UIImageView*)[updateCell viewWithTag:kTAG_IMAGE];
imageView.image=[UIImage imageWithContentsOfFile:[path stringByAppendingPathComponent:fileName]];
imageView.layer.cornerRadius = 23.0;
imageView.layer.borderColor = (__bridge CGColorRef)([UIColor clearColor]);
imageView.layer.borderWidth = 1.0;
imageView.clipsToBounds = YES;
imageView.contentMode = UIViewContentModeScaleAspectFill;
[updateCell setNeedsLayout];
});
});
}
}
}
return cell;
}
- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"4");
@try {
cell = [Netroads willDisplayFlatDesignCell:cell];
}
@catch (NSException *exception) {
NSLog(@"%s, exception.reason: %@", __PRETTY_FUNCTION__, exception.reason);
}
}
+ (UITableViewCell*)willDisplayFlatDesignCell:(UITableViewCell*)cell
{
UILabel *label = [[UILabel alloc] initWithFrame:cell.frame];
label.backgroundColor = [UIColor colorWithRed:200.0/255.0 green:200.0/255.0 blue:200.0/255.0 alpha:1]; // light gray color, native iphone
cell.selectedBackgroundView = label;
cell.textLabel.backgroundColor = [UIColor clearColor];
cell.textLabel.textAlignment = NSTextAlignmentRight;
cell.textLabel.textColor = [UIColor darkGrayColor];
if (cell.detailTextLabel.text) {
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.textAlignment = NSTextAlignmentRight;
cell.detailTextLabel.textColor = [UIColor darkGrayColor];
}
return cell;
}
这让我觉得这些对象（文本，标题）如何通过2014-04-29 12:01:15.182 Cellular Radar[3331:60b] {
Date = "22/01/14";
Owner = "\U05de\U05e2\U05e8\U05db\U05ea";
Text = {
};
Time = "09:27";
Title = {
};
WallID = 1;
imageUrl = system;
}
检查？
答案 0 :(得分：5)
您正在将单元格的text属性设置为字典：
cell.textLabel.text = dict[@"Title"];
从dict
Title = {
};
和
detailTextLabel.text = dict[@"Text"];
从dict
Text = {
};
不清楚dict应该使用哪些值，但不应该是那些词典。
答案 1 :(得分：3)
原因：NSDictionary没有lengh方法，但NSString有
更改此行
if (imageUrl.length > 0)
{
要
if ([imageUrl isKindOfClass:[NSString class]] && imageUrl.length > 0)
{
答案 2 :(得分：1)
根据您的日志，您尝试以NSDictionary身份访问NSString个对象。这就是导致上述错误的原因。
问题应该在这里..
NSString *imageUrl = dict[@"imageUrl"];
如果是它的字典，它应该在这一行崩溃..
if (imageUrl.length > 0)
答案 3 :(得分：1)
在tableView:willDisplayCell:forRowAtIndexPath:，
检查此行，
cell = [Netroads willDisplayFlatDesignCell:cell];
此方法有问题，[Netroads willDisplayFlatDesignCell];
您正试图从length而不是NSDictionary获取NSArray。如果要从JSON Web服务加载数据，可能正在将NSDictionary解析为NSArray。修复该方法，然后它不会崩溃。