NSPredicate使用（2）——比较运算

NSNumber *testNumber = @123;

// =，==：判断两个表达式是否相等，
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF = 123"];
NSLog(@"%@ vs 123: %@",testNumber,([predicate evaluateWithObject:testNumber] ? @"相等" : @"不相等"));

// >=，=>：判断左边表达式的值是否大于或等于右边表达式的值
predicate = [NSPredicate predicateWithFormat:@"SELF >= 200"];
NSLog(@"%@ vs 200: %@",([predicate evaluateWithObject:testNumber] ? @"大于等于" : @"小于"));

// <=，=<：判断右边表达式的值是否小于或等于右边表达式的值
predicate = [NSPredicate predicateWithFormat:@"SELF <= 150"];
NSLog(@"%@ vs 150: %@",([predicate evaluateWithObject:testNumber] ? @"小于等于" : @"大于"));

// >：判断左边表达式的值是否大于右边表达式的值
predicate = [NSPredicate predicateWithFormat:@"SELF > 123"];
NSLog(@"%@ vs 123: %@",([predicate evaluateWithObject:testNumber] ? @"大于" : @"小于等于"));

// <：判断左边表达式的值是否小于右边表达式的值
predicate = [NSPredicate predicateWithFormat:@"SELF < 123"];
NSLog(@"%@ vs 123: %@",([predicate evaluateWithObject:testNumber] ? @"小于" : @"大于等于"));

// !=、<>：判断两个表达式是否不相等
predicate = [NSPredicate predicateWithFormat:@"SELF != 123"];
NSLog(@"%@ vs 123: %@",([predicate evaluateWithObject:testNumber] ? @"不相等" : @"相等"));

// BETWEEN：BETWEEN表达式必须满足表达式 BETWEEN {下限，上限}的格式，要求该表达式必须大于或等于下限，并小于或等于上限
predicate = [NSPredicate predicateWithFormat:@"SELF BETWEEN {100,200}"];
NSLog(@"%@ vs {100,200}: %@",([predicate evaluateWithObject:testNumber] ? @"包含" : @"不包含"));

运行结果

2018-03-05 15:28:23.701 DemoNSPredicate[2472:315182] 123 vs 123: 相等
2018-03-05 15:28:23.701 DemoNSPredicate[2472:315182] 123 vs 200: 小于
2018-03-05 15:28:23.701 DemoNSPredicate[2472:315182] 123 vs 150: 小于等于
2018-03-05 15:28:23.701 DemoNSPredicate[2472:315182] 123 vs 123: 小于等于
2018-03-05 15:28:23.702 DemoNSPredicate[2472:315182] 123 vs 123: 大于等于
2018-03-05 15:28:23.702 DemoNSPredicate[2472:315182] 123 vs 123: 相等
2018-03-05 15:28:23.702 DemoNSPredicate[2472:315182] 123 vs {100,200}: 包含
2018-03-05 15:28:23.702 DemoNSPredicate[2472:315182] 123 vs 251: 不相等