Simple use of NSPredicate in query, nspredicate Query

Simple use of NSPredicate in query, nspredicate Query

Run the code. Each piece of code can be run directly with comments and running results.

// Directly use = to strictly match NSArray * arrOriginal = [NSArray arrayWithObjects: @ "c1", @ "c", @ "cd", @ "cdd ", @ "cd", nil]; NSString * match = @ "cd"; NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "SELF =%@", match]; NSArray * results = [arrOriginal filteredArrayUsingPredicate: predicate]; NSLog (@ "result = % @", results );

Print result:
Result = (
Cd,
Cd
)

// Like match, similar to the usage in SQL NSArray * arrOriginal = [NSArray arrayWithObjects: @ "c1", @ "d", @ "cd", @ "cdd ", @ "dd", @ "dcd", @ "cdc", nil]; NSString * match = @ "c *"; // NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "SELF like % @", match]; NSArray * results = [arrOriginal filteredArrayUsingPredicate: predicate]; NSLog (@ "result = % @", results );

Print result:
Result = (
C1,
Cd,
Cdd,
Cdc
)

// Match NSArray with case-insensitive characters * arrOriginal = [NSArray arrayWithObjects: @ "Cdd", @ "cDc", @ "cdd", @ "dcdd", nil]; NSString * match = @ "cd *"; NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "SELF like [c] % @", match]; NSArray * results = [arrOriginal response: predicate]; NSLog (@ "result = % @", results );

Print result:
Result = (
Cdd,
CDc,
Cdd
)

// Use regular expression to filter NSArray * arrOriginal = [NSArray arrayWithObjects: @ "c1", @ "C3", @ "d2", @ "c2", nil]; NSString * match = @ "^ c \ d? "; NSPredicate * predicate = [NSPredicate predicateWithFormat: @" SELF matches % @ ", match]; NSArray * results = [arrOriginal filteredArrayUsingPredicate: predicate]; NSLog (@ "result = % @", results );

Print result:
Result = (
C1,
C2
)

// Filter NSArray * arrFilter = [NSArray arrayWithObjects: @ "aa", @ "bb", nil]; NSArray * arrOriginal = [NSArray arrayWithObjects: @ "dds", @ "bb", @ "c1", @ "C3", @ "bb", @ "aa", @ "c2", nil]; NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "NOT (SELF in % @)", arrFilter]; // NSArray * results = [arrOriginal attributes: predicate]; NSLog (@ "result = % @", results );

Print result:
Result = (
Dds,
C1,
C3,
C2
)