I managed to customize the UIAlertView putting two UITextFields as subviews inside of it but in doing so somehow the keyboard broke.
When I try to dismiss it resigning the first responder it doesn't do anything just stays there.
Here's my code, well, only relevant parts (this is what I put in a UIAlertView subclass):
#pragma mark -
#pragma mark UIView
- (void)layoutSubviews
{
[super layoutSubviews];
NSArray *subviews = [self subviews];
UIView *backgroundView = [subviews objectAtIndex:0];
CGRect firstFrame = [[subviews objectAtIndex:2] frame];
CGRect backgroundFrame = [backgroundView frame];
CGFloat displacement = kTextHeight * 2 + kPadding * 3;
CGFloat pivot = firstFrame.origin.y + firstFrame.size.height;
CGRect nameFrame = CGRectMake(firstFrame.origin.x,
pivot + kPadding,
kTextWidth, kTextHeight);
CGRect descriptionFrame = CGRectMake(firstFrame.origin.x,
pivot + kTextHeight + kPadding * 2,
kTextWidth, kTextHeight);
if (_nameField == nil && _descriptionField == nil) {
// first UITextField
_nameField = [[UITextField alloc] initWithFrame:CGRectZero];
[_nameField setPlaceholder:kNamePlaceholder];
[_nameField setBorderStyle:UITextBorderStyleRoundedRect];
[_nameField setDelegate:self];
// second UITextField
_descriptionField =
[[UITextField alloc] initWithFrame:CGRectZero];
[_descriptionField setPlaceholder:kDescriptionPlaceholder];
[_descriptionField setBorderStyle:UITextBorderStyleRoundedRect];
[_descriptionField setDelegate:self];
[self addSubview:_nameField];
[self addSubview:_descriptionField];
}
// set the new frames to each text field
[_nameField setFrame:nameFrame];
[_descriptionField setFrame:descriptionFrame];
// increment background image-view height by "displacement"
backgroundFrame.size.height += displacement;
[backgroundView setFrame:backgroundFrame];
// displace by "diplacement" every subview positioned after "pivot"
for (UIView *view in subviews) {
CGRect viewRect = [view frame];
if (viewRect.origin.y > pivot)
[view setFrame:CGRectOffset(viewRect, 0., displacement)];
}
}
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
return YES;
}
#pragma mark -
#pragma mark <UITextFieldDelegate>
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return NO;
}
Here's my code in one big chunk:
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
static CGFloat kTextWidth = 260.;
static CGFloat kTextHeight = 25.;
static CGFloat kPadding = 10.;
static NSString *kNamePlaceHolder = @"Name";
static NSString *kDescriptionPlaceHolder = @"Description";
// interfaces
@interface AppDelegate: NSObject <UIApplicationDelegate>
{
UIWindow *_window;
}
- (void)showAlertView;
@end
@interface AlertView: UIAlertView <UITextFieldDelegate>
{
UITextField *_nameField;
UITextField *_descriptionField;
}
@end
// implementations
@implementation AppDelegate
#pragma mark -
#pragma mark NSObject
- (void)dealloc
{
[_window release];
[super dealloc];
}
#pragma mark -
#pragma mark AppDelegate
- (void)showAlertView
{
AlertView *alertView = [[[AlertView alloc] initWithTitle:@"Title"
message:@"Body" delegate:nil
cancelButtonTitle:@"Ok" otherButtonTitles:nil] autorelease];
[alertView show];
}
#pragma mark -
#pragma mark <UIApplicationDelegate>
- (BOOL) application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)options
{
_window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[_window setBackgroundColor:[UIColor whiteColor]];
[_window makeKeyAndVisible];
[NSTimer scheduledTimerWithTimeInterval:3. target:self
selector:@selector(showAlertView) userInfo:nil repeats:NO];
return YES;
}
@end
@implementation AlertView
#pragma mark -
#pragma mark NSObject
- (void)dealloc
{
[_nameField setDelegate:nil];
[_descriptionField setDelegate:nil];
[_nameField release];
[_descriptionField release];
[super dealloc];
}
#pragma mark -
#pragma mark UIView
- (void)layoutSubviews
{
[super layoutSubviews];
NSArray *subviews = [self subviews];
UIView *backgroundView = [subviews objectAtIndex:0];
CGRect firstFrame = [[subviews objectAtIndex:2] frame];
CGRect backgroundFrame = [backgroundView frame];
CGFloat displacement = kTextHeight * 2 + kPadding * 3;
CGFloat pivot = firstFrame.origin.y + firstFrame.size.height;
CGRect nameFrame = CGRectMake(firstFrame.origin.x,
pivot + kPadding,
kTextWidth, kTextHeight);
CGRect descriptionFrame = CGRectMake(firstFrame.origin.x,
pivot + kTextHeight + kPadding * 2,
kTextWidth, kTextHeight);
if (_nameField == nil && _descriptionField == nil) {
// first UITextField
_nameField = [[UITextField alloc] initWithFrame:CGRectZero];
[_nameField setPlaceholder:kNamePlaceholder];
[_nameField setBorderStyle:UITextBorderStyleRoundedRect];
[_nameField setDelegate:self];
// second UITextField
_descriptionField =
[[UITextField alloc] initWithFrame:CGRectZero];
[_descriptionField setPlaceholder:kDescriptionPlaceholder];
[_descriptionField setBorderStyle:UITextBorderStyleRoundedRect];
[_descriptionField setDelegate:self];
[self addSubview:_nameField];
[self addSubview:_descriptionField];
}
// set the new frames to each text field
[_nameField setFrame:nameFrame];
[_descriptionField setFrame:descriptionFrame];
// increment background image-view height by "displacement"
backgroundFrame.size.height += displacement;
[backgroundView setFrame:backgroundFrame];
// displace by "diplacement" every subview positioned after "pivot"
for (UIView *view in subviews) {
CGRect viewRect = [view frame];
if (viewRect.origin.y > pivot)
[view setFrame:CGRectOffset(viewRect, 0., displacement)];
}
}
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
return YES;
}
#pragma mark -
#pragma mark <UITextFieldDelegate>
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return NO;
}
@end
int main(int argc, char **argv)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil,
NSStringFromClass([AppDelegate class]));
[pool drain];
return retVal;
}
My solution was to override becomeFirstResponder in the UIAlertView subclass:
- (BOOL)becomeFirstResponder
{
// For some unkown reason UIAlertView can be first responder. Disabling
// this completely fixes this bug http://stackoverflow.com/q/6866932/434423
// BTW, overriding "canBecomeFirstResponder" to return "NO" doesn't work,
// this is why we override this instead of "canBecomeFirstResponder".
return NO;
}
I'll post all my code in case someone needs it. Properly handles UIAlertView customization.
CustomizableAlertView.h
@class UIAlertView;
@interface CustomizableAlertView: UIAlertView
{
UIView *_customSubview;
}
@property (nonatomic, retain) UIView *customSubview;
@end
CustomizableAlertView.m
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
#import "CustomizableAlertView.h"
static CGFloat kVerticalPadding = 10.;
static CGFloat kMinHorizontalPadding = 12.;
static NSString *kTransformKeyPath = @"transform";
@interface CustomizableAlertView (Private)
- (void)centerViewOnKeyboardDismissal:(UIControl *)control;
@end
@implementation CustomizableAlertView
#pragma mark -
#pragma mark NSObject
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[_customSubview release];
[super dealloc];
}
#pragma mark -
#pragma mark NSObject (NSKeyValueObserving)
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
// Make sure we are observing kTransformKeyPath from self
if (_customSubview != nil && self == object &&
[keyPath isEqualToString:kTransformKeyPath]) {
// We should remove the observing object to avoid a recursion
[self removeObserver:self forKeyPath:kTransformKeyPath];
CGFloat displacement =
[_customSubview frame].size.height / 2. + kVerticalPadding;
[self setTransform:
CGAffineTransformMakeTranslation(.0, -displacement)];
// Resume the observation
[self addObserver:self forKeyPath:kTransformKeyPath options:0
context:NULL];
}
}
#pragma mark -
#pragma mark UIResponder
- (BOOL)becomeFirstResponder
{
// For some unkown reason UIAlertView can be first responder. Disabling
// this completely fixes this bug http://stackoverflow.com/q/6866932/434423
// BTW, overriding "canBecomeFirstResponder" to return "NO" doesn't work,
// this is why we override this instead of "canBecomeFirstResponder".
return NO;
}
#pragma mark -
#pragma mark UIView
- (void)layoutSubviews
{
[super layoutSubviews];
NSArray *subviews = [self subviews];
UIView *messageView = nil;
UIView *backgroundView = nil;
// Perform a pattern search instead of depending on UIAlertView internal
// structure.
// This fetches the background view.
for (UIView *view in subviews)
if ([view isKindOfClass:[UIImageView class]]) {
backgroundView = view;
break;
}
// Perform a pattern search instead of depending on UIAlertView internal
// structure
// This fetches the view that we'll use as an anchor.
for (UIView *view in subviews)
if ([view isKindOfClass:[UILabel class]] &&
[[(UILabel *)view text] isEqualToString:[self message]]) {
messageView = view;
break;
}
if (backgroundView == nil || messageView == nil)
// Abort if there were no matches
return;
CGRect bounds = [self bounds];
CGRect messageFrame = [messageView frame];
CGRect backgroundFrame = [backgroundView frame];
CGRect customFrame = [_customSubview frame];
CGFloat displacement = customFrame.size.height + kVerticalPadding * 2.;
CGFloat pivot = messageFrame.origin.y + messageFrame.size.height;
// increment background image-view height by "displacement"
backgroundFrame.size.height += displacement;
[backgroundView setFrame:backgroundFrame];
// displace by "diplacement" every subview positioned after "pivot"
for (UIView *view in subviews) {
CGRect viewRect = [view frame];
if (viewRect.origin.y > pivot)
[view setFrame:CGRectOffset(viewRect, .0, displacement)];
}
CGFloat maxWidth = bounds.size.width - kMinHorizontalPadding * 2.;
if (customFrame.size.width > maxWidth)
customFrame.size.width = maxWidth;
[_customSubview setFrame:CGRectOffset(customFrame,
(bounds.size.width - customFrame.size.width) / 2.,
pivot + kVerticalPadding)];
if ([_customSubview superview] == nil)
[self addSubview:_customSubview];
}
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
// perform hit-test for every subview
for (UIView *view in [self subviews])
if ([view pointInside:[self convertPoint:point toView:view]
withEvent:event])
return YES;
return NO;
}
#pragma mark -
#pragma mark UIAlertView
- (void)show
{
NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
[defaultCenter addObserver:self
selector:@selector(centerViewOnKeyboardDismissal:)
name:UITextFieldTextDidEndEditingNotification object:nil];
[defaultCenter addObserver:self
selector:@selector(centerViewOnKeyboardDismissal:)
name:UITextViewTextDidEndEditingNotification object:nil];
// Dammit! we need to observe value-changes for the property "transform" to
// handle properly the UIAlertView relocation.
// We need to hang this onto "show" because UIAlertView's designated
// initializer is imposible to override due to its variadic parameter (...).
[self addObserver:self forKeyPath:kTransformKeyPath options:0 context:NULL];
[super show];
}
- (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex
animated:(BOOL)animated
{
// Cease to observe kTransformKeyPath upon dismissal
[self removeObserver:self forKeyPath:kTransformKeyPath];
[super dismissWithClickedButtonIndex:buttonIndex animated:animated];
}
#pragma mark -
#pragma mark CustomizableAlertView
@synthesize customSubview = _customSubview;
- (void)centerViewOnKeyboardDismissal:(UIControl *)control
{
CGRect bounds = [[self superview] bounds];
[self setCenter:CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds))];
}
@end