實用知識：NSPredicate（謂詞）的使用

#import "ViewController.h"
#import "Person.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    [self test3];
}

- (void)test3{

    Person *p1 = [Person new];
    p1.name = @"張三";
    p1.age = 14;

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.age > 15"];

    //使用謂詞評估對象
    BOOL result = [predicate evaluateWithObject:p1];

    if (result) {

        NSLog(@"大於15歲");
    }else{

        NSLog(@"小於15歲");
    }


}


- (void)test2{

    Person *p1 = [Person new];
    p1.name = @"張三";
    p1.age = 18;

    Person *p2 = [Person new];
    p2.name = @"李四";
    p2.age = 17;

    Person *p3 = [Person new];
    p3.name = @"王五";
    p3.age = 14;

    Person *p4 = [Person new];
    p4.name = @"張扇風";
    p4.age = 20;

    Person *p5 = [Person new];
    p5.name = @"張點";
    p5.age = 15;

    NSArray *persons = @[p1,p2,p3,p4,p5];

    //查找包含'張'的人
    NSString *name = @"張三";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.name == %@",name];

    NSArray *results = [persons filteredArrayUsingPredicate:predicate];

    NSLog(@"%@",[results valueForKey:@"name"]);

    for (Person *p in results) {
        NSLog(@"%@",p.name);
    }

}

- (void)test1{

    NSArray *array = @[@"23451345",@"2222435",@"54674578",@"dryjtuj",@"467222"];

    //篩選出字符串含有 "222" 的字符串

    //謂詞(條件)-語句不區分大小寫
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self CONTAINS '222'"];

    //使用謂詞去過濾
    NSArray *results = [array filteredArrayUsingPredicate:predicate];

    NSLog(@"%@",results);


}

@end