#import <Foundation/Foundation.h>@interface NSArray (Category)//以下写法均防止闪退+ (instancetype)safeArrayWithObject:(id)object;- (id)safeObjectAtIndex:(NSUInteger)index;- (NSArray *)safeSubarrayWithRange:(NSRange)range;- (NSUInteger)safeIndexOfObject:(id)anObject;//通过Plist名取到Plist文件中的数组+ (NSArray *)arrayNamed:(NSString *)name;// 数组转成json 字符串- (NSString *)toJSONStringForArray;@end

#import "NSArray+Category.h"@implementation NSArray (Category)- (id)safeObjectAtIndexedSubscript:(NSUInteger)index{    if (index >= self.count) {        return nil;    } else {        return [self objectAtIndex:index];    }}- (id)safeObjectAtIndex:(NSUInteger)index{    if (index >= self.count) {        return nil;    } else {        return [self objectAtIndex:index];    }}+ (instancetype)safeArrayWithObject:(id)object{    if (object == nil) {        return [self array];    } else {        return [self arrayWithObject:object];    }}- (NSArray *)safeSubarrayWithRange:(NSRange)range{    NSUInteger location = range.location;    NSUInteger length = range.length;    if (location + length > self.count) {        //超过了边界,就获取从loction开始所有的item        if ((location + length) > self.count) {            length = (self.count - location);            return [self safeSubarrayWithRange:NSMakeRange(location, length)];        }                return nil;    }    else {        return [self subarrayWithRange:range];    }}- (NSUInteger)safeIndexOfObject:(id)anObject{    if (anObject == nil) {        return NSNotFound;    } else {        return [self indexOfObject:anObject];    }}+ (NSArray *)arrayNamed:(NSString *)name{    NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"plist"];    return [NSArray arrayWithContentsOfFile:path];}- (NSString *)toJSONStringForArray{    NSData *paramsJSONData = http://www.mamicode.com/[NSJSONSerialization dataWithJSONObject:self options:0 error:nil];    return [[NSString alloc] initWithData:paramsJSONData encoding:NSUTF8StringEncoding];}@end

#import <Foundation/Foundation.h>@interface NSDictionary (Category)//用于数据解析，返回对象为字符串或值类型，数组和字典不要用此方法- (id)safeObjectForKey:(NSString *)key;//设置键值对 针对对象为空处理- (void)safeSetObject:(id)object forKey:(id)key;- (id)objectForKeyCustom:(id)aKey;- (id)safeKeyForValue:(id)value;/** *  字段转成json的字符串 * *  @return json 字符串 */- (NSString *)toJSONStringForDictionary;@end

#import "NSDictionary+Category.h"@implementation NSDictionary (Category)- (id)safeObjectForKey:(NSString *)key {    if (key == nil || [self isKindOfClass:[NSNull class]]) {        return nil;    }    id object = [self objectForKey:key];    if (object==nil || object == [NSNull null]) {        return @"";    }    return object;}- (void)safeSetObject:(id)object forKey:(id)key {    if ([key isKindOfClass:[NSNull class]]) {        return;    }    if ([object isKindOfClass:[NSNull class]]) {        [self setValue:@"" forKey:key];    }else{        [self setValue:object forKey:key];    }}- (id)objectForKeyCustom:(id)aKey {    id object   = nil;        // 检查是否字典对象    if (![self isKindOfClass:[NSDictionary class]]) {        return object;    }        // 保证key必须为字符串    if (aKey && [aKey isKindOfClass:[NSString class]]) {        object  = [self objectForKeyCustom:aKey];    }        return object;}- (id)safeKeyForValue:(id)value {    for (id key in self.allKeys) {        if ([value isEqual:[self objectForKey:key]]) {            return key;        }    }    return nil;}- (NSString *)toJSONStringForDictionary{    NSData *paramsJSONData = http://www.mamicode.com/[NSJSONSerialization dataWithJSONObject:self options:0 error:nil];    return [[NSString alloc] initWithData:paramsJSONData encoding:NSUTF8StringEncoding];}@end