1 倒序
NSMutableArray *uploadImageArray = [NSMutableArray new] ;
uploadImageArray= (NSMutableArray*)[[uploadImageArray reverseObjectEnumerator]allObjects];
2 数组拷贝
NSMutableArray *mutableCopyArr = [searchArray mutableCopy];
3 判断数组内容是否已经存在（包含）
BOOL isbool = [mutableCopyArr containsObject: searchBar.text];
4 将数组中的内容拼接成字符串
NSString *string = [array componentsJoinedByString:@","];// , 分隔符
5 将字符串切割成数组
NSString*a = [[NSStringalloc]initWithString:@"冬瓜，西瓜，火龙果，大头，小狗"];
NSArray *b = [a componentsSeparatedByString:@"，"];
NSString*a3 = [bobjectAtIndex:2];
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