iOS&Mac优雅的处理数据为空情况

浅浅的花香味﹌ 2024-02-18 23:47 31阅读 0赞

新建CheckNullTool类继承自NSObject，在代码中使用方式：

NSArray *listData = nil;
    listData = [CheckNullTool replaceNullData:listData];
    
    NSString *phone = nil;
    phone = [CheckNullTool replaceNullData:phone];

#import "CheckNullTool.h"
    @implementation CheckNullTool
    ///主要调用该方法
    + (id)replaceNullData:(id)obj {
        if ([obj isKindOfClass:[NSDictionary class]]) {
            return [self replaceNullWithDictionary:obj];
        } else if ([obj isKindOfClass:[NSArray class]]) {
            return [self replaceNullWithArray:obj];
        } else if ([obj isKindOfClass:[NSNumber class]]) {
            if ([obj isKindOfClass:[NSNull class]] || obj == nil) {
                obj = @(0);
            }
            return obj;
        } else if ([obj isKindOfClass:[NSString class]]) {
            return [self replaceNullValue:obj];
        }
        return obj;
    }
    ///处理字典
    + (id)replaceNullWithDictionary:(NSMutableDictionary *)dic {
        NSMutableDictionary *tempDic = [NSMutableDictionary dictionary];
        NSArray *allKey = [dic allKeys];
        for (NSString *key in allKey) {
            [tempDic setObject:[self replaceNullData:dic[key]] forKey:key];
        }
        return tempDic;
    }
    ///处理数组
    + (id)replaceNullWithArray:(NSMutableArray *)arr {
        __block NSMutableArray *tempArr = [NSMutableArray array];
        [arr enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            [tempArr addObject:[self replaceNullData:obj]];
        }];
        return tempArr;
    }
    ///处理字符串
    + (NSString *)replaceNullValue: (NSString *)string {
        NSString * newStr = [NSString stringWithFormat:@"%@",string];
        if ([newStr isKindOfClass:[NSNull class]] ||
            newStr == nil ||
            [newStr isEqualToString:@"(null)"] ||
            [newStr isEqualToString:@""] ||
            [newStr isEqualToString:@"null"] ||
            [newStr isEqualToString:@"<null>"]) {
            newStr = @"";
        }
        return newStr;
    }
    @end