217 lines
9.5 KiB
Objective-C
217 lines
9.5 KiB
Objective-C
/*
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File: AAPLTextViewController.m
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Abstract: A view controller that demonstrates how to use UITextView.
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Version: 2.12
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Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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Inc. ("Apple") in consideration of your agreement to the following
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terms, and your use, installation, modification or redistribution of
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this Apple software constitutes acceptance of these terms. If you do
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not agree with these terms, please do not use, install, modify or
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redistribute this Apple software.
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In consideration of your agreement to abide by the following terms, and
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subject to these terms, Apple grants you a personal, non-exclusive
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license, under Apple's copyrights in this original Apple software (the
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"Apple Software"), to use, reproduce, modify and redistribute the Apple
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Software, with or without modifications, in source and/or binary forms;
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provided that if you redistribute the Apple Software in its entirety and
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without modifications, you must retain this notice and the following
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text and disclaimers in all such redistributions of the Apple Software.
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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be used to endorse or promote products derived from the Apple Software
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without specific prior written permission from Apple. Except as
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expressly stated in this notice, no other rights or licenses, express or
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implied, are granted by Apple herein, including but not limited to any
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patent rights that may be infringed by your derivative works or by other
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works in which the Apple Software may be incorporated.
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The Apple Software is provided by Apple on an "AS IS" basis. APPLE
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
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STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
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*/
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#import "AAPLTextViewController.h"
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@interface AAPLTextViewController()<UITextViewDelegate>
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@property (nonatomic, weak) IBOutlet UITextView *textView;
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// Used to adjust the text view's height when the keyboard hides and shows.
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@property (nonatomic, weak) IBOutlet NSLayoutConstraint *textViewBottomLayoutGuideConstraint;
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@end
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#pragma mark -
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@implementation AAPLTextViewController
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- (void)viewDidLoad {
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[super viewDidLoad];
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[self configureTextView];
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}
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- (void)viewWillAppear:(BOOL)animated {
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[super viewWillAppear:animated];
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// Listen for changes to keyboard visibility so that we can adjust the text view accordingly.
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[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(handleKeyboardNotification:) name:UIKeyboardWillShowNotification object:nil];
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[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(handleKeyboardNotification:) name:UIKeyboardWillHideNotification object:nil];
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}
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- (void)viewDidDisappear:(BOOL)animated {
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[super viewDidDisappear:animated];
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[NSNotificationCenter.defaultCenter removeObserver:self name:UIKeyboardWillShowNotification object:nil];
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[NSNotificationCenter.defaultCenter removeObserver:self name:UIKeyboardWillHideNotification object:nil];
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}
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#pragma mark - Keyboard Event Notifications
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- (void)handleKeyboardNotification:(NSNotification *)notification {
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NSDictionary *userInfo = notification.userInfo;
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UIViewAnimationCurve animationCurve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue];
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// Transform the UIViewAnimationCurve to a UIViewAnimationOptions mask.
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UIViewAnimationOptions animationOptions = UIViewAnimationOptionBeginFromCurrentState;
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if (animationCurve == UIViewAnimationCurveEaseIn) {
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animationOptions |= UIViewAnimationOptionCurveEaseIn;
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}
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else if (animationCurve == UIViewAnimationCurveEaseInOut) {
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animationOptions |= UIViewAnimationOptionCurveEaseInOut;
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}
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else if (animationCurve == UIViewAnimationCurveEaseOut) {
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animationOptions |= UIViewAnimationOptionCurveEaseOut;
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}
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else if (animationCurve == UIViewAnimationCurveLinear) {
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animationOptions |= UIViewAnimationOptionCurveLinear;
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}
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NSTimeInterval animationDuration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
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// Convert the keyboard frame from screen to view coordinates.
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CGRect keyboardScreenEndFrame = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
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CGRect keyboardScreenBeginFrame = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
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CGRect keyboardViewEndFrame = [self.view convertRect:keyboardScreenEndFrame fromView:self.view.window];
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CGRect keyboardViewBeginFrame = [self.view convertRect:keyboardScreenBeginFrame fromView:self.view.window];
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CGFloat originDelta = keyboardViewEndFrame.origin.y - keyboardViewBeginFrame.origin.y;
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// The text view should be adjusted, update the constant for this constraint.
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self.textViewBottomLayoutGuideConstraint.constant -= originDelta;
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[self.view setNeedsUpdateConstraints];
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[UIView animateWithDuration:animationDuration delay:0 options:animationOptions animations:^{
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[self.view layoutIfNeeded];
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} completion:nil];
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// Scroll to the selected text once the keyboard frame changes.
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NSRange selectedRange = self.textView.selectedRange;
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[self.textView scrollRangeToVisible:selectedRange];
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}
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#pragma mark - Configuration
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- (void)configureTextView {
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UIFontDescriptor *bodyFontDescriptor = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleBody];
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self.textView.font = [UIFont fontWithDescriptor:bodyFontDescriptor size:0];
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self.textView.textColor = UIColor.blackColor;
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self.textView.backgroundColor = UIColor.whiteColor;
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self.textView.scrollEnabled = YES;
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// Let's modify some of the attributes of the attributed string.
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// You can modify these attributes yourself to get a better feel for what they do.
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// Note that the initial text is visible in the storyboard.
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NSMutableAttributedString *attributedText = [self.textView.attributedText mutableCopy];
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NSString *text = self.textView.text;
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// Find the range of each element to modify.
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NSRange boldRange = [text rangeOfString:NSLocalizedString(@"bold", nil)];
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NSRange highlightedRange = [text rangeOfString:NSLocalizedString(@"highlighted", nil)];
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NSRange underlinedRange = [text rangeOfString:NSLocalizedString(@"underlined", nil)];
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NSRange tintedRange = [text rangeOfString:NSLocalizedString(@"tinted", nil)];
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// Add bold.
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UIFontDescriptor *boldFontDescriptor = [self.textView.font.fontDescriptor fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold];
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UIFont *boldFont = [UIFont fontWithDescriptor:boldFontDescriptor size:0];
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[attributedText addAttribute:NSFontAttributeName value:boldFont range:boldRange];
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// Add highlight.
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[attributedText addAttribute:NSBackgroundColorAttributeName value:UIColor.aapl_applicationGreenColor range:highlightedRange];
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// Add underline.
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[attributedText addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:underlinedRange];
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// Add tint.
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[attributedText addAttribute:NSForegroundColorAttributeName value:UIColor.aapl_applicationBlueColor range:tintedRange];
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// Add an image attachment.
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NSTextAttachment *textAttachment = [NSTextAttachment new];
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UIImage *image = [UIImage imageNamed:@"text_view_attachment"];
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textAttachment.image = image;
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textAttachment.bounds = CGRectMake(0, 0, image.size.width, image.size.height);
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NSAttributedString *textAttachmentString = [NSAttributedString attributedStringWithAttachment:textAttachment];
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[attributedText appendAttributedString:textAttachmentString];
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self.textView.attributedText = attributedText;
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}
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#pragma mark - UITextViewDelegate
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- (void)adjustTextViewSelection:(UITextView *)textView {
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// Ensure that the text view is visible by making the text view frame smaller as text can be slightly cropped at the bottom.
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// Note that this is a workaround to a bug in iOS.
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[textView layoutIfNeeded];
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CGRect caretRect = [textView caretRectForPosition:textView.selectedTextRange.end];
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caretRect.size.height += textView.textContainerInset.bottom;
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[textView scrollRectToVisible:caretRect animated:NO];
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}
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- (void)textViewDidBeginEditing:(UITextView *)textView {
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// Provide a "Done" button for the user to select to signify completion with writing text in the text view.
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UIBarButtonItem *doneBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneBarButtonItemClicked)];
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[self.navigationItem setRightBarButtonItem:doneBarButtonItem animated:YES];
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[self adjustTextViewSelection:textView];
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}
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- (void)textViewDidChangeSelection:(UITextView *)textView {
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[self adjustTextViewSelection:textView];
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}
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#pragma mark - Actions
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- (void)doneBarButtonItemClicked {
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// Dismiss the keyboard by removing it as the first responder.
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[self.textView resignFirstResponder];
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[self.navigationItem setRightBarButtonItem:nil animated:YES];
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}
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@end
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