小编Lox*_*oxx的帖子

这是我正在做的事情:

- (void)doCreateGroup {
    [[self contentView] endEditing:true];

    NSString * newString = [[[[self contentView] groupNameField] text] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    NSString * firstError = nil;
    if ([newString length] == 0) {
        firstError = @"Missing group name";
    }

    NSError * groupsError = nil;
    NSArray * groups = [self.contactStore groupsMatchingPredicate:nil error:&groupsError];

    for (CNGroup * group in groups) {
        if ([group.name isEqualToString:newString]) {
            firstError = @"Group already exists";
        }
    }

    if (firstError) {
        [self presentViewController:[WLGCommonUtilities doProcessErrorWithOkay:@"Error" errorMessage:firstError] animated:YES completion:nil];
        return;
    }

    CNMutableGroup * newGroup = [CNMutableGroup …