1。第一種解決方案 javascript
就是在每個 可能傳回null 的地方 使用 if([object isEqual:[NSNUll null]]) 去判斷html
2。第二種解決方案java
網上傳說老外寫了一個Category,叫作NullSafe..只支持到ios9,3 ,實測 並無解決個人問題..ios
NullSafe的原理見 http://www.javashuo.com/article/p-hsfhknmc-by.htmlgit
3。第三種解決方案github
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];json
AFJSONResponseSerializer *serializer = [AFJSONResponseSerializer serializer];數組
serializer.removesKeysWithNullValues = YES;網絡
[serializer setAcceptableContentTypes:[NSSet setWithObjects:@"application/json", @"text/html",@"text/json",@"text/javascript",@"text/plain", nil]];app
manager.responseSerializer=serializer;
manager.requestSerializer = [AFJSONRequestSerializer serializer];
不知道爲何無效,有大神給指導一下嗎
4。第四種解決方案
json轉model時,每一個model里加上
- (id)valueForUndefinedKey:(NSString *)key
{
return nil;
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
}
5。第5種解決方案
在數組和字典的category裏面寫的兩個方法. 完美解決..在每次請求回來數據,統一處理..
廢話很少說,上代碼
字典的類目:
#import "NSDictionary+Extension.h"
#import "NSArray+Extension.h"
@implementation NSDictionary (Extension)
- (NSDictionary *)dictionaryByReplacingNulls {
const NSMutableDictionary *replaced = [self mutableCopy];
const id nul = [NSNull null];
for (NSString *key in self) {
id object = [self objectForKey:key];
if (object == nul) [replaced removeObjectForKey:key];
else if ([object isKindOfClass:[NSDictionary class]]) [replaced setObject:[object dictionaryByReplacingNulls] forKey:key];
else if ([object isKindOfClass:[NSArray class]]) [replaced setObject:[object arrayByReplacingNulls] forKey:key];
}
return [NSDictionary dictionaryWithDictionary:[replaced copy]];
}
@end
數組的類目:
#import "NSArray+Extension.h"
#import "NSDictionary+Extension.h"
@implementation NSArray (Extension)
- (NSArray *)arrayByReplacingNulls {
NSMutableArray *replaced = [self mutableCopy];
const id nul = [NSNull null];
for (int idx = 0; idx < [replaced count]; idx++) {
id object = [replaced objectAtIndex:idx];
if (object == nul) [replaced removeObjectAtIndex:idx];
else if ([object isKindOfClass:[NSDictionary class]]) [replaced replaceObjectAtIndex:idx withObject:[object dictionaryByReplacingNulls]];
else if ([object isKindOfClass:[NSArray class]]) [replaced replaceObjectAtIndex:idx withObject:[object arrayByReplacingNulls]];
}
return [replaced copy];
}
@end
在封裝的網絡請求獲取到後臺數據的地方 將數據處理一下
NSDictionary *dict = [responseObject dictionaryByReplacingNulls];
success(dict);
6。第6種解決方案
大力推薦:
AvoidCrash不再怕程序崩潰啦 AvoidCrash的功能不單單是數組,還有報錯字典等許多功能,具體用法能夠參考https://github.com/chenfanfang/AvoidCrash
個人項目目前調用了3456這4種解決方案。請各位大神幫我分析利弊。