Question

我试图将NSArray保存到包含元素或对象的Existing MutableArray。

我成功地将数组添加到mutablemarray并记录了数组并记录了它的数组计数。在我想将5个保存的值添加到UITableView之前，一切似乎都没问题。

我的应用程序崩溃，有一个奇怪的例外。我已经尝试过一切，但似乎没有任何工作。

我不知道在哪里继续调试。

在应用开始时保存了Prefs。

for (NSMutableDictionary *defineXMLData in getSpecialsAuth) {

NSArray * imageUrl = [defineXMLData objectForKey:@"imageUrl"];
[specialsimageUrlArray addObject: imageUrl];
[specialsimageUrlArray addObject: test];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setObject:specialsimageUrlArray forKey:@"specialsImageUrlArray"];

}

SpecialsViewController.m

-(void)viewDidLoad {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
self.specialsArray = [prefs arrayForKey:@"specialsImageUrlArray"];
NSMutableArray *specialsimageUrlArray =[[NSMutableArray alloc]init];
test = [NSArray arrayWithObjects:@"http://dev.wigroup.co/bells/cvs_images/bells3.jpg", nil];           
}

-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
 NSData *imageData= [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[self.specialsArray objectAtIndex:indexPath.row]]];    
UIImageView *imageViewForCell = [[UIImageView alloc]initWithFrame:CGRectMake(3,3,30,30)];
imageViewForCell.image = [UIImage imageWithData:imageData];
[imv addSubview:imageViewForCell];

 }

的NSLog

 SpecialsArray (
"http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
"http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
"http://dev.wigroup.co/bells/cvs_images/bells3.jpg",
"http://dev.wigroup.co/bells/cvs_images/bells2.jpg",
    (
    "http://dev.wigroup.co/bells/cvs_images/bells3.jpg"
)
)

Specials Count (
 5
 )

错误记录

  -[__NSCFArray length]: unrecognized selector sent to instance 0x15dde4f0
CRASH: -[__NSCFArray length]: unrecognized selector sent to instance 0x15dde4f0
 Stack Trace: (
0   CoreFoundation                      0x2f3bbe9b <redacted> + 154
1   libobjc.A.dylib                     0x397186c7 objc_exception_throw + 38
2   CoreFoundation                      0x2f3bf7b7 <redacted> + 202
3   CoreFoundation                      0x2f3be0af <redacted> + 706
4   CoreFoundation                      0x2f30cdc8 _CF_forwarding_prep_0 + 24
5   CoreFoundation                      0x2f311983 _CFURLInitWithURLString + 38
6   Foundation                          0x2fcf49a1 <redacted> + 212
7   Foundation                          0x2fcf48b3 <redacted> + 50
8   Bells                               0x0009b157 -[SpecialsDetailViewController downloadSpecialImage] + 110
9   Foundation                          0x2fd9633f __NSFireDelayedPerform + 414
10  CoreFoundation                      0x2f386e7f <redacted> + 14
11  CoreFoundation                      0x2f386a9b <redacted> + 794
12  CoreFoundation                      0x2f384e23 <redacted> + 1218
13  CoreFoundation                      0x2f2ef471 CFRunLoopRunSpecific + 524
14  CoreFoundation                      0x2f2ef253 CFRunLoopRunInMode + 106
15  GraphicsServices                    0x340292eb GSEventRunModal + 138
16  UIKit                               0x31ba4845 UIApplicationMain + 1136
17  Bells                               0x00142f61 main + 116
18  libdyld.dylib                       0x39c11ab7 <redacted> + 2
)

Answer 1

此日志：

 SpecialsArray (
    "http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells3.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells2.jpg",
    (
        "http://dev.wigroup.co/bells/cvs_images/bells3.jpg"
    )
)

显示您的specials数组包含4个字符串和1个数组。因此，当您尝试将每个项目用作字符串时，您会遇到问题。

原因是：

[specialsimageUrlArray addObject: test];

因为test是一个数组，所以您应该使用addObjectsFromArray:添加其内容。

Answer 2

SpecialsArray (
    "http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells1.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells3.jpg",
    "http://dev.wigroup.co/bells/cvs_images/bells2.jpg",
    (
        "http://dev.wigroup.co/bells/cvs_images/bells3.jpg"
    )
)

当您尝试从前4个网址获取NSData时，它正在运行，但第5个元素是NSArray（或NSMutableArray）。

因此NSData *imageData= [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[self.specialsArray objectAtIndex:indexPath.row]]];行在执行[NSURL URLWithString:[self.specialsArray objectAtIndex:indexPath.row]]时会遇到问题，即将数组对象从NSURL转换为NSString。 但它是ARRAY。这就是原因。

您应该使用isKindOfClass

检查对象的类型

一个小例子

if([[self.specialsArray objectAtIndex:indexPath.row] isKindOfClass:[NSString class]])

{
  // It's NSString
}
else if([[self.specialsArray objectAtIndex:indexPath.row] isKindOfClass:[NSArray class]] || [[self.specialsArray objectAtIndex:indexPath.row] isKindOfClass:[NSMutableArray class]])
{
   // It's an array
}

NSCFArray长度错误iOS

2 个答案: