启动时ios应用程序崩溃

Question

我开始在我的iphone应用程序中使用crashlytics,它似乎在启动期间(或者我猜的是启动时)为某些用户崩溃.这是堆栈跟踪:

Fatal Exception: NSInvalidArgumentException
-[NSNull rangeOfCharacterFromSet:]: unrecognized selector sent to instance 0x19687eba0
Thread : Fatal Exception: NSInvalidArgumentException
0  CoreFoundation                 0x00000001854aa59c __exceptionPreprocess + 132
1  libobjc.A.dylib                0x0000000195bfc0e4 objc_exception_throw + 60
2  CoreFoundation                 0x00000001854b1664 __methodDescriptionForSelector
3  CoreFoundation                 0x00000001854ae418 ___forwarding___ + 928
4  CoreFoundation                 0x00000001853b2b6c _CF_forwarding_prep_0 + 92
5  UIKit                          0x0000000189fc38a0 -[UILabel _contentInsetsFromFonts] +    104
6  UIKit                          0x000000018a13ac90 -[_UILabelLayer updateContentInsets] + 76
7  UIKit                          0x000000018a13ad50 -[_UILabelLayer updateContentLayerSize] + 56
8  UIKit                          0x000000018a13ae34 -[_UILabelLayer layoutSublayers] + 36
9  QuartzCore                     0x00000001895ac564    CA::Layer::layout_if_needed(CA::Transaction*) + 320
10 QuartzCore                     0x00000001895ac408 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 32
11 QuartzCore                     0x00000001895abc08 CA::Context::commit_transaction(CA::Transaction*) + 276
12 QuartzCore                     0x00000001895ab98c CA::Transaction::commit() + 436
13 QuartzCore                     0x00000001895a53bc CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 80
14 CoreFoundation                 0x0000000185462a50 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
15 CoreFoundation                 0x000000018545f9dc __CFRunLoopDoObservers + 360
16 CoreFoundation                 0x000000018545fdbc __CFRunLoopRun + 836
17 CoreFoundation                 0x000000018538d0a4 CFRunLoopRunSpecific + 396
18 GraphicsServices               0x000000018e52f5a4 GSEventRunModal + 168
19 UIKit                          0x0000000189cc23c0 UIApplicationMain + 1488
20 partybutton                    0x00000001000d6de0 main (main.m:16)
21 libdyld.dylib                  0x000000019626aa08 start + 4

不确定如何调试这个,因为我无法自己重现.有什么指针吗？

Answer 1

我有类似的问题.来自服务器的JSON响应包含NULL/null.像这样的东西:

"result":[
    {
        "id":"44",
        "message":null,
    }]

我创建了一个NSNull类.然后添加NSString导致异常的方法.

NSNull + JSON.h文件:

#import <UIKit/UIKit.h>

@interface NSNull(JSON)

@end

NSNull + JSON.m文件:

@implementation NSNull (JSON)

- (NSUInteger)length { return 0; }

- (NSInteger)integerValue { return 0; };

- (float)floatValue { return 0; };

- (NSString *)description { return @"0(NSNull)"; }

- (NSArray *)componentsSeparatedByString:(NSString *)separator { return @[]; }

- (id)objectForKey:(id)key { return nil; }

- (BOOL)boolValue { return NO; }

- (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet{
    NSRange nullRange = {NSNotFound, 0};
    return nullRange;
}

//add methods of NSString if needed

@end

通过这样做,我不必在每个变量中检查NULL.