Iphone 使用谓词筛选词典
我使用的是一个NSDictionary,它本身包含一些键及其值的字典Iphone 使用谓词筛选词典,iphone,objective-c,nsdictionary,nspredicate,Iphone,Objective C,Nsdictionary,Nspredicate,我使用的是一个NSDictionary,它本身包含一些键及其值的字典 { "1" = { "key1" = "ss", "key2" = "rr", "name" = "nm" }, "2" = { "key1" = "tt", "key2" = "vv", "name" = "gf" }, "3" = { "key1" = "nm"
{
"1" = {
"key1" = "ss",
"key2" = "rr",
"name" = "nm"
},
"2" = {
"key1" = "tt",
"key2" = "vv",
"name" = "gf"
},
"3" = {
"key1" = "nm",
"key2" = "vv",
"name" = "gf"
},
"4" = {
"key1" = "tt",
"key2" = "vv",
"name" = "gf"
},
}
我需要使用NSPredicate过滤key1应该是“tt”而key2应该是“vv”的情况
NSDictionary *d = [NSDictionary dictionaryWithObjectsAndKeys:
[NSArray arrayWithObjects:@"a", @"b", @"c", nil], @"a",
[NSArray arrayWithObjects:@"b", @"c", @"a", nil], @"b",
[NSArray arrayWithObjects:@"c", @"a", @"b", nil], @"c",
[NSArray arrayWithObjects:@"a", @"b", @"c", nil], @"d",
nil];
NSPredicate *p = [NSPredicate predicateWithFormat:@"%@[SELF][0] == 'a'", d];
NSLog(@"%@", p);
NSArray *keys = [d allKeys];
NSArray *filteredKeys = [keys filteredArrayUsingPredicate:p];
NSLog(@"%@", filteredKeys);
NSDictionary *matchingDictionary = [d dictionaryWithValuesForKeys:filteredKeys];
NSLog(@"%@", matchingDictionary);
试试这对你真的很有帮助。这很有效。您可以在此处设置自己的值
NSArray *data = [NSArray arrayWithObjects:[NSMutableDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"ss",@"how", nil] forKeys:[NSArray arrayWithObjects:@"key1",@"key1", nil]],[NSMutableDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"tt",@"vv", nil] forKeys:[NSArray arrayWithObjects:@"key1",@"key2", nil]],[NSMutableDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"vv",@"tt", nil] forKeys:[NSArray arrayWithObjects:@"key1",@"key2", nil]],nil];
NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(key1 == %@) AND (key2==%@)", @"tt",@"vv"]];
NSLog(@"%@",filtered);
输出:
(
{
key1 = tt;
key2 = vv;
}
)
(
{
key1 = tt;
key2 = vv;
}
)
为了更清楚地解释:
NSMutableDictionary *dict4=[[NSMutableDictionary alloc]init];
[dict4 setObject:@"ss" forKey:@"key1"];
[dict4 setObject:@"how" forKey:@"key2"];
NSMutableDictionary *dict5=[[NSMutableDictionary alloc]init];
[dict5 setObject:@"tt" forKey:@"key1"];
[dict5 setObject:@"vv" forKey:@"key2"];
NSMutableDictionary *dict6=[[NSMutableDictionary alloc]init];
[dict6 setObject:@"vv" forKey:@"key1"];
[dict6 setObject:@"tt" forKey:@"key2"];
NSMutableArray *data = [[NSMutableArray alloc]init];
[data addObject:dict4];
[data addObject:dict5];
[data addObject:dict6];
NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(key1 == %@) AND (key2==%@)", @"tt",@"vv"]];
NSLog(@"%@",filtered);
输出:
(
{
key1 = tt;
key2 = vv;
}
)
(
{
key1 = tt;
key2 = vv;
}
)
假定
mainDict = {
"1" = {
"key1" = "ss",
"key2" = "rr",
"name" = "nm"
},
"2" = {
"key1" = "tt",
"key2" = "vv",
"name" = "gf"
},
"3" = {
"key1" = "nm",
"key2" = "vv",
"name" = "gf"
},
"4" = {
"key1" = "tt",
"key2" = "vv",
"name" = "gf"
},
}
现在,您可以通过以下方式进行过滤:
NSArray *resultArray = [[mainDict allValues] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(key1 == %@) AND (key2==%@)", @"tt",@"vv"]];
请尝试以下检查:
NSMutableDictionary *mainDict=[[NSMutableDictionary alloc] init];
for(int i=1; i<=3; i++)
{
[mainDict setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"tt",@"key1",@"vv",@"key2",@"ttqwdwd",@"name", nil] forKey:[NSString stringWithFormat:@"%i",i]];
}
[mainDict setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"tt",@"key1",@"kk",@"key2",@"ttwwdwd",@"name", nil] forKey:[NSString stringWithFormat:@"%i",4]];
[mainDict setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"tt",@"key1",@"kk",@"key2",@"ttwwdwd",@"name", nil] forKey:[NSString stringWithFormat:@"%i",5]];
NSArray *resultArray = [[mainDict allValues] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(key1 == %@) AND (key2==%@)", @"tt",@"vv"]];
NSLog(@"%@",resultArray);
NSMutableDictionary*mainDict=[[NSMutableDictionary alloc]init];
对于(int i=1;i您可以使用输入传递测试键方法NSDictionary
例如
参考资料:在此处检查答案: