结合之前的学习笔记以及參考《Objective-C编程全解(第三版)》，对Objective-C知识点进行梳理总结。知识点一直在变，仅仅是作为參考，以苹果官方文档为准~

十八、谓语的使用及实例说明

首先先介绍基本经常使用的谓词：
（1）逻辑运算符 && AND || OR 都能够用
（2）IN包括
（3）模糊查询
a、以……开头 BEGINSWITH
b、以……结尾 ENDSWITH
c、包括….字符 CONTAINS
（4）用like进行模糊查询
通配符：*表示随意个字符 ？表示单个字符

like *a  以a结尾
like a*  以a开头
like *a* 包括a字符
like ?a* 第二个字符为a的字符串

实例说明：

创建Book类，Book.h

@interface Book : NSObject
{NSInteger _price;NSString* _bookName;
}- (instancetype)initWithPrice:(NSInteger)price andBookName:(NSString *)bookName;@end

Book.h

#import "Book.h"@implementation Book- (instancetype)initWithPrice:(NSInteger)price andBookName:(NSString *)bookName {if (self = [super init]) {_price = price;_bookName = bookName;}return self;
}- (NSString *)description {return [NSString stringWithFormat:@"Book price:%li,named %@",_price,_bookName];
}@end

main.m

int main(int argc, const char * argv[]) {@autoreleasepool {Book* book1 = [[Book alloc] initWithPrice:20 andBookName:@"C Programming"];Book* book2 = [[Book alloc] initWithPrice:32 andBookName:@"C++ Programming"];Book* book3 = [[Book alloc] initWithPrice:18 andBookName:@"Java Programming"];Book* book4 = [[Book alloc] initWithPrice:45 andBookName:@"OC guiding"];Book* book5 = [[Book alloc] initWithPrice:28 andBookName:@"iOS guiding"];NSArray* books = [NSArray arrayWithObjects:book1,book2,book3,book4,book5, nil];NSPredicate *predicate = [NSPredicate predicateWithFormat:@"price > %i",30];NSArray *filterArray = [books filteredArrayUsingPredicate:predicate];NSLog(@"%@",filterArray);//      逻辑运算符 和 INpredicate = [NSPredicate predicateWithFormat:@"bookName IN {'C Programming','C++ Programming'} AND price > 30"];filterArray = [books filteredArrayUsingPredicate:predicate];NSLog(@"%@",filterArray);//      模糊查询 和 用通配符查询predicate = [NSPredicate predicateWithFormat:@"bookName CONTAINS 'guiding' || bookName like '*Program*' "]; //包括guiding或者包括ProgramfilterArray = [books filteredArrayUsingPredicate:predicate];NSLog(@"%@",filterArray);}return 0;
}

output：

2015-07-09 20:17:24.403 exercise_谓语[632:9877] ("Book price:32,named C++ Programming","Book price:45,named OC guiding"
)
2015-07-09 20:17:24.404 exercise_谓语[632:9877] ("Book price:32,named C++ Programming"
)
2015-07-09 20:17:24.407 exercise_谓语[632:9877] ("Book price:20,named C Programming","Book price:32,named C++ Programming","Book price:18,named Java Programming","Book price:45,named OC guiding","Book price:28,named iOS guiding"
)