iOS-项目开发中，对后台返回数据为时候的处理,避免取值产生程序崩溃问题

最新推荐文章于 2024-11-24 07:00:00 发布

MinggeQingchun

最新推荐文章于 2024-11-24 07:00:00 发布

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本文介绍两种在iOS开发中优化网络请求的方法：一是利用AFNetworking库进行请求过滤，通过设置去除null值；二是使用runtime为NSNull类别增加属性，实现更安全的数据处理。

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方法一：使用AFNetworking进行请求过滤设置：

((AFJSONResponseSerializer *)manager.responseSerializer).removesKeysWithNullValues = YES;

方法二：使用runtime来给类别增加属性

NSNull+Safe.m

#import <objc/runtime.h>
#import <Foundation/Foundation.h>

static NSString *dataKey = @"key";

@interface NSNull ()

@property (strong, nonatomic) NSMutableDictionary *data;

@end


@implementation NSNull (Safe)
#pragma mark - LifeCycle
- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector{
    @synchronized([self class]){
        NSString *selString = NSStringFromSelector(selector);
        NSMethodSignature *signature = nil;
        NSRange range = [selString rangeOfString:@"set"];
        if (range.length) {
            signature = [NSMethodSignature signatureWithObjCTypes:"v@:@"];
        } else {
            signature = [NSMethodSignature signatureWithObjCTypes:"@@:"];
        }
        return signature;
    }
}


- (void)forwardInvocation:(NSInvocation *)invocation{
    NSString *key = NSStringFromSelector(invocation.selector);
    NSRange range = [key rangeOfString:@"set"];
    if (range.length) {
        key = [[key substringFromIndex:3] lowercaseString];
        id obj;
        [invocation getArgument:&obj atIndex:2];
        [self.data setObject:obj forKey:key];
        
    } else {
        id obj = self.data[key];
        [invocation setReturnValue:&obj];
    }
}

#pragma mark - Private
- (NSMutableDictionary *)data {
    NSMutableDictionary *data = objc_getAssociatedObject(self, &dataKey);
    while (!data) {
        objc_setAssociatedObject(self, &dataKey, [NSMutableDictionary dictionary], OBJC_ASSOCIATION_COPY_NONATOMIC);
        data = objc_getAssociatedObject(self, &dataKey);
    }
    return data;
}

@end