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NSPredicate
NSPredicate是一个Foundation类，它指定数据被获取或者过滤的方式。
它的查询语言就像SQL的WHERE和正则表达式的交叉一样，提供了具有表现力的，自然语言界面来定义一个集合被搜寻的逻辑条件。
NSPredicate的几种用法
①常见形式
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == 'zhangdan'"];
//注意:如果谓词串中的文本块未被引用,则被看做是键路径,即需要用引号表明是字符串,单引号,双引号均可.
键路径可以在后台包含许多强大的功能 ②计算谓词
让谓词通过某个对象来计算自己的值,给出BOOL值.例如:
NSPredicate *predicate = [NSPredicate predicateWithFormat: @"name == 'zhangsan'"];
BOOL match = [predicate evaluateWithObject: person];
NSLog (@"%s", (match) ? "YES" : "NO");
//注上面的person是人对象
③燃料过滤器 filteredArrayUsingPredicate:是NSArray数组的一种类别方法,循环过滤数组中的内容,将值为YES的对象累积到结果数组中返回.
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"n"]; NSArray *results = [arr filteredArrayUsingPredicate: predicate]; NSLog (@"%@", results);④格式说明书
%d和%@表示插入数值和字符串,%K表示key 还可以引入变量名,用$,类似环境变量,如:@"name == $NAME",再用predicateWithSubstitutionVariables调用来构造新的谓词(键/值字典),其中键是变量名,值是要插入的内容,注意这种情况下不能把变量当成键路径,只能用作值.
predicate = [NSPredicate predicateWithFormat: @"name == %@", @"zhangsan"];
predicate = [NSPredicate predicateWithFormat: @"%K == %@", @"name", @"zhangsan"];
NSPredicate *predicateTemplate =[NSPredicate predicateWithFormat:@"name == $NAME"];
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:
@"zhangsan", @"NAME", nil];
NSPredicate *predicate = [predicateTemplate predicateWithSubstitutionVariables:
dic];
NSLog(@"%@", predicate);
⑤比较和逻辑运算符
==等于 >:大于 >=和=>:大于或等于 <:小于 <=和=<:小于或等于 !=和<>:不等于
括号和逻辑运算AND、OR、NOT或者C样式的等效表达式&& || !
注意：不等号适用于数字和字符串
NSArray *arrayFilter = [NSArray arrayWithObjects:@"abc1", @"abc2", nil];
NSArray *arrayContent = [NSArray arrayWithObjects:@"a1",
@"abc1", @"abc4", @"abc2", nil];
NSPredicate *thePredicate = [NSPredicate predicateWithFormat:
@"NOT (SELF in %@)", arrayFilter];
[arrayContent filterUsingPredicate:thePredicate]; ⑥数组字符串
predicate = [NSPredicate predicateWithFormat:
@"engine.horsepower BETWEEN { 50, 200 }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name IN { 'Herbie',
'Snugs', 'Badger', 'Flap' }"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", [results valueForKey: @"name"]); ⑦.字符串运算符
BEGINSWITH ENDSWITH CONTAINS
[c]:后缀表示不区分大小写 [d]:不区分发音符号 [cd]:后缀不区分大小写和不区分发音符号,
例如: @"name CONTAIN[cd] ‘ang‘" //包含某个字符串
@"name BEGINSWITH[c] ‘sh‘" //以某个字符串开头
@"name ENDSWITH[d] ‘ang‘" //以某个字符串结束
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH 'Bad'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name ENDSWITH 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name BEGINSWITH[cd] 'HERB'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
⑧.LIKE运算符
LIKE：左边的表达式等于右边的表达式：?和*可作为通配符，其中?匹配1个字符，*匹配0个或者多个字符。
LIKE也接受[cd]符号
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '*er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);
predicate = [NSPredicate predicateWithFormat: @"name LIKE[cd] '???er*'"];
results = [cars filteredArrayUsingPredicate: predicate];
NSLog (@"%@", results);⑨.MATCHES可以使用正则表达式 NSString *regex1 = @"^A.+e$"; //以A开头，e结尾
NSString *regex = @"[A-Za-z]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
if ([predicate evaluateWithObject:aString]) {
}⑩.self就表示对象本身 NSArray *arrayFilter = [NSArray arrayWithObjects:@"abc1", @"abc2", nil];
NSArray *arrayContent = [NSArray arrayWithObjects:@"a1", @"abc1", @"abc4", @"abc2", nil];
NSPredicate *thePredicate = [NSPredicate predicateWithFormat:@"NOT (SELF in %@)", arrayFilter];
[arrayContent filterUsingPredicate:thePredicate];①①.合计操作
ANY，SOME：指定下列表达式中的任意元素。比如，ANY children.age < 18。
ALL：指定下列表达式中的所有元素。比如，ALL children.age < 18。
NONE：指定下列表达式中没有的元素。比如，NONE children.age < 18。它在逻辑上等于NOT (ANY ...)。
IN：等于SQL的IN操作，左边的表达必须出现在右边指定的集合中。比如，name IN { ‘Ben‘, ‘Melissa‘, ‘Nick‘ }。
①②.NSPredicate +predicateWithBlock:(块语法)
NSPredicate *shortNamePredicate = [NSPredicate predicateWithBlock:
^BOOL(id evaluatedObject, NSDictionary *bindings) {
return [[evaluatedObject firstName] length] <= 5;
}];
// ["Alice Smith", "Bob Jones"]
NSLog(@"Short Names: %@", [people filteredArrayUsingPredicate:shortNamePredicate]);①③.NSCompoundPredicate<span style="font-size:18px;"> //例如，下列谓词是相等的：
[NSCompoundPredicate andPredicateWithSubpredicates:
@[[NSPredicate predicateWithFormat:@"age > 25"],
[NSPredicate predicateWithFormat:@"firstName = %@", @"Quentin"]]];
[NSPredicate predicateWithFormat:@"(age > 25) AND (firstName = %@)", @"Quentin"];</span>- (BOOL)isMobileNumber:(NSString *)mobileNum
{
// 正则判断手机号码地址格式
/**
* 手机号码
* 移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
* 联通：130,131,132,152,155,156,185,186
* 电信：133,1349,153,180,189
*/
NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
/**
* 中国移动：China Mobile
* 134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
*/
NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
/**
* 中国联通：China Unicom
* 130,131,132,152,155,156,185,186
*/
NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
/**
* 中国电信：China Telecom
* 133,1349,153,180,189
*/
NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";
/**
* 大陆地区固话及小灵通
* 区号：010,020,021,022,023,024,025,027,028,029
* 号码：七位或八位
*/
// NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:
@"SELF MATCHES %@", MOBILE];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum] == YES)
|| ([regextestcm evaluateWithObject:mobileNum] == YES)
|| ([regextestct evaluateWithObject:mobileNum] == YES)
|| ([regextestcu evaluateWithObject:mobileNum] == YES))
{
if([regextestcm evaluateWithObject:mobileNum] == YES) {
NSLog(@"China Mobile");
} else if([regextestct evaluateWithObject:mobileNum] == YES) {
NSLog(@"China Telecom");
} else if ([regextestcu evaluateWithObject:mobileNum] == YES) {
NSLog(@"China Unicom");
} else {
NSLog(@"Unknow");
}
return YES;
}
else
{
return NO;
}
}
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原文地址：http://blog.csdn.net/zfx5130/article/details/43372955
