iOS: NSArray的方法filteredArrayUsingPredicate:

- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate

用谓语筛选数组，返回一个新数组。

example

NSMutableArray *array =

[NSMutableArray arrayWithObjects:@"Nick", @"Ben", @"Adam", @"Melissa", nil];

NSPredicate *bPredicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] 'a'"];

NSArray *beginWithB = [array filteredArrayUsingPredicate:bPredicate];

// beginWithB contains { @"Adam" }.

NSPredicate *sPredicate = [NSPredicate predicateWithFormat:@"SELF contains[c] 'e'"];

[array filterUsingPredicate:sPredicate];

// array now contains { @"Nick", @"Ben", @"Melissa" }