BZGFormViewController

BZGFormViewController is a simple library for making dynamic forms.

Demo app

Navigate to /SignupForm, run pod install, and open SignupForm.xcworkspace to see the signup form above in action.

Installation

Cocoapods, or copy the contents of /BZGFormViewController into your project.

Quick start

First, subclass BZGFormViewController.

@interface SignupViewController : BZGFormViewController

Next, import "BZGFormFieldCell.h" and create a cell.

#import "BZGFormFieldCell.h"

// ...

self.usernameFieldCell = [BZGFormFieldCell new];
self.usernameFieldCell.label.text = @"Username";
self.usernameFieldCell.textField.placeholder = @"Username";
self.usernameFieldCell.textField.keyboardType = UIKeyboardTypeASCIICapable;

To validate text and update the cell whenever the field's text changes, use the cell's shouldChangeTextBlock.

self.usernameFieldCell.textField.delegate = self;
self.usernameFieldCell.shouldChangeTextBlock = ^BOOL(BZGFormFieldCell *cell, NSString *newText) {
    if (newText.length < 5) {
        cell.validationState = BZGValidationStateInvalid;
    } else {
        cell.validationState = BZGValidationStateValid;
    }
    return YES;
};

Each BZGFormFieldCell has a BZGFormInfoCell property. If validation fails, you should set the info cell's text using setText:. To show the info cell, set shouldShowInfoCell to YES. Don't forget to hide the info cell when you have nothing to show.

self.usernameFieldCell.shouldChangeTextBlock = ^BOOL(BZGFormFieldCell *cell, NSString *newText) {
    if (newText.length < 5) {
        cell.validationState = BZGValidationStateInvalid;
        [cell.infoCell setText:@"Username must be at least 5 characters long."];
        cell.shouldShowInfoCell = YES;
    } else {
        cell.validationState = BZGValidationStateValid;
        cell.shouldShowInfoCell = NO;
    }
    return YES;
};

You should use shouldChangeTextBlock, didBeginEditingBlock, didEndEditingBlock, and shouldReturnBlock for validation and any logic you would usually put in UITextFieldDelegate methods.

BZGFormViewController automatically scrolls the tableview when you begin editing a field and jumps to the next field when you hit return.

After you've configured your cells, set formFieldCells to an array containing your form's cells.

self.formFieldCells = [NSMutableArray arrayWithArray:@[self.usernameFieldCell,
                                                       self.emailFieldCell,
                                                       self.passwordFieldCell]];

If you're using a table view with multiple sections, specify the section your form (i.e. the cells in self.formFieldCells) should appear in.

self.formSection = 0

Finally, override the UITableViewDataSource methods. Be sure to use the values from super when you're dealing with the table view's form section.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (section == self.formSection) {
        return [super tableView:tableView numberOfRowsInSection:section];
    } else {
        return 1;
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == self.formSection) {
        return [super tableView:tableView cellForRowAtIndexPath:indexPath];
    } else {
        return self.signupCell;
    }
}

Configuration

If you want to customize things like fonts and colors, first try forking and editing /BZGFormViewController/Constants.h. If there's anything you can't configure from there, please submit an issue (or pull request)!

Contributing

Please write tests and make sure existing tests still pass. I'll add Travis soon, but for now, run tests from the demo project in /SignupForm. See the Roadmap for planned improvements.