I want to change the cursor position in TextView...
// NoteView objective _c class its super class is TextView...
#import "NoteView.h"
#implementation NoteView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.backgroundColor =[UIColor whiteColor];
self.contentMode = UIViewContentModeRedraw;
self.font = [UIFont fontWithName:#"Helvetica Neue" size:14];
}
return self;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
//Get the current drawing context
CGContextRef context = UIGraphicsGetCurrentContext();
//Set the line color and width
// CGContextSetStrokeColorWithColor(context, [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.2f].CGColor);
CGContextSetStrokeColorWithColor(context,[UIColor colorWithRed:0.29804f green:0.12157f blue:0.9f alpha:0.1].CGColor);
//Start a new Path
CGContextBeginPath(context);
//Find the number of lines in our textView + add a bit more height to draw lines in the empty part of the view
NSUInteger numberOfLines = (self.contentSize.height + self.bounds.size.height) / self.font.leading;
//Set the line offset from the baseline. (I'm sure there's a concrete way to calculate this.)
CGFloat baselineOffset = 6.0f;
//iterate over numberOfLines and draw each line
for (int x = 0; x < numberOfLines; x++) {
//0.5f offset lines up line with pixel boundary
CGContextMoveToPoint(context, self.bounds.origin.x, self.font.leading*x + 0.5f + baselineOffset);
CGContextAddLineToPoint(context, self.bounds.size.width, self.font.leading*x + 0.5f + baselineOffset);
}
//Close our Path and Stroke (draw) it
CGContextClosePath(context);
CGContextStrokePath(context);
}
//its a view controller class and here i imported NotesView here
#import "NotesViewController.h"
#interface NotesViewController ()
#end
#implementation NotesViewController
// i load the textView frame whatever i created class above
- (void)loadView {
[super loadView];
CGSize result = [[UIScreen mainScreen] bounds].size;
CGFloat scale = [UIScreen mainScreen].scale;
result = CGSizeMake(result.width*scale, result.height * scale);
if (result.height==1136)
{
_TextView = [[NoteView alloc] initWithFrame:CGRectMake(29,50,266,430)];
backgroundView.frame=CGRectMake(10,32,300,450);
}
else
{
_TextView = [[NoteView alloc] initWithFrame:CGRectMake(29,50,266,340)];
backgroundView.frame=CGRectMake(10,32,300,360);
}
[self.view addSubview:_TextView];
_TextView.delegate = self;
UIView *lineView = [[UIView alloc]initWithFrame:CGRectMake(30,40,1,backgroundView.frame.size.height-5)];
lineView.backgroundColor = [UIColor brownColor];
lineView.alpha=0.3;
[self.view addSubview:lineView];
UIView *lineView1 = [[UIView alloc]initWithFrame:CGRectMake(32,40,1,backgroundView.frame.size.height-5)];
lineView1.backgroundColor = [UIColor brownColor];
lineView1.alpha=0.3;
[self.view addSubview:lineView1];
}
}
}
// in view did load i set the delegate and code for cursor position
- (void)viewDidLoad
{
[super viewDidLoad];
// setting delegate here
_TextView.delegate=self;
_TextView.editable = YES;
[_TextView setSelectedRange:NSMakeRange(10, 0)];
}
I write all the delegate methods for Textview and ScrollView of Textview I the cursor positon is starts the vertical line after.... I'm not expressed well please understand based on images... I want cursor position... I want to set my Textview with real note application in iPhone.. I add Textview to ViewController all works well but cursor stats starting position... I want to cursor position always horizontal line........ Try to give solution based on the images..
Do it like this image.
Here you have to set the position of your textview in your VC so it will come after the horizontal line.
Related
I am using CoreText to draw text in multiple columns (depending on the orientation of the iPad).
To test, I've created an NSMutableString composed of the numbers 100 - 999. This text spans 5 columns, 1 or 2 of which are onscreen (depending on the orientation).
To my main ViewController I've added a custom UIScrollView to hold this text, and I want it to be scrollable.
I've noticed that the scrollview doesn't scroll until I set:
[myScrollView setContentMode:UIViewContentModeRedraw];
I do want the scrollView to call drawRect when the iPad is rotated (to adjust the number of columns)!
My issue with this though is that it seems to call drawRect over and over and over ... while scrolling (and thus allocates more and more memory, also causing some lag).
I add the UIScrollView to my main viewController like so:
myScrollView = [[CoreTextTestUIView alloc] init];
myScrollView.parentView = self;
if(FACING == #"PU" || FACING == #"PD")
{
myScrollView.frame = CGRectMake(0,50,768,974);
}
else
{
myScrollView.frame = CGRectMake(0,50,1024,718);
}
[myScrollView setContentMode:UIViewContentModeRedraw];
[container addSubview:myScrollView];
Again, I want drawRect to be called when the iPad is rotated, so the number of columns can change ... BUT I do not want it to call drawRect when I simply try to scroll the UIScrollView.
Can someone help me please?
...
below is the .m for my UIScrollView:
#import "CoreTextTestUIView.h"
#import <CoreText/CoreText.h>
#implementation CoreTextTestUIView
#synthesize parentView;
NSMutableString *testText;
-(id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if(self)
{
// Initialization code
//set BG color
self.backgroundColor = [[UIColor alloc] initWithRed:134 green:166 blue:228 alpha:1.0];
//UIScrollView Stuff
//self.delegate = self;
self.scrollEnabled = YES;
self.pagingEnabled = YES;
self.userInteractionEnabled = YES;
[self becomeFirstResponder];
self.showsVerticalScrollIndicator = NO;
self.showsHorizontalScrollIndicator = NO;
self.bounces = NO;
self.alwaysBounceHorizontal = YES;
self.alwaysBounceVertical = NO;
//generate long text
testText = [[NSMutableString alloc] initWithString:#""];
for(int i = 100; i < 1000; i++)
{
[testText appendString:[NSString stringWithFormat:#"%i ",i]];
}
self.alpha = 0.0;
[self fadeIn];
}
return self;
}
-(void)fadeIn
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1.0];
[UIView setAnimationDelegate:self];
//[UIView setAnimationDidStopSelector:#selector(animationFinished:finished:context:)];
self.alpha = 1.0;
[UIView commitAnimations];
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
-(void)drawRect:(CGRect)rect
{
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:#"%#",testText]];
//set font
CTFontRef helvetica = CTFontCreateWithName(CFSTR("Helvetica"), 40.0, NULL);
[string addAttribute:(id)kCTFontAttributeName
value:(id)helvetica
range:NSMakeRange(0, [string length])];
//layout master
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string);
//flip the coordinate system
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetTextMatrix(context, CGAffineTransformIdentity);
CGContextTranslateCTM(context, 0, self.bounds.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
int textPos = 0;
int columnIndex = 0;
//how many columns? (orientation dependent)
float howManyColumns;
if(parentView.FACING == #"PU" || parentView.FACING == #"PD")
{
howManyColumns = 1.0;
}
else
{
howManyColumns = 2.0;
}
//create columns in loop
while(textPos < [string length])
{
NSLog(#"column started");
//column form
CGMutablePathRef columnPath = CGPathCreateMutable();
CGPathAddRect(columnPath, NULL,
CGRectMake((self.bounds.size.width/howManyColumns*columnIndex), 0,
(self.bounds.size.width/howManyColumns),
self.bounds.size.height));
//column frame
CTFrameRef columnFrame = CTFramesetterCreateFrame(framesetter,
CFRangeMake(textPos, 0),
columnPath,
NULL);
//use the column path
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(textPos, 0), columnPath, NULL);
CFRange frameRange = CTFrameGetVisibleStringRange(frame);
//draw
CTFrameDraw(columnFrame, context);
//cleanup
CFRelease(columnFrame);
CGPathRelease(columnPath);
textPos += frameRange.length;
columnIndex++;
}
//set scrollView content size
int totalPages = (columnIndex+1)/howManyColumns;
self.contentSize = CGSizeMake(totalPages*self.bounds.size.width, self.frame.size.height);
//release
CFRelease(framesetter);
[string release];
}
-(void)dealloc
{
[super dealloc];
[parentView release];
[testText release];
}
#end
Looking at this, I can't see where you are setting the contentSize of your scrollView. If you do not set the contentSize of your scrollView, scrolling will not be enabled, and you will only see what fits within the current area of the scrollView. Also, if your text is static in a configuration, consider optimizing out some of the redrawing that is occurring and add it to a subview of the scrollView.
That is how drawRect works. It is called every single time that the view moves or changes or has something overlapping it. If you are managing memory correctly this shouldn't be a problem.
I want to position a UILabel in the center of my Circle but I can't seem to affect the position of the label. I can only seem to affect the position of the label by changing the height of CGRect frame. changing the other values doesn't affect the position at all.
here's my Circle.m code
- (id)initWithFrame:(CGRect)frame radius:(CGFloat)aRadius color:(UIColor*) aColor {
self = [super initWithFrame:frame];
if (self) {
self.opaque = NO;
[self setRadius:aRadius];
[self setColor:aColor];
}
return self;
}
- (void)drawRect:(CGRect)rect
{
NSString *string = #"1";
UIFont* font = [UIFont systemFontOfSize:80];
UILabel *label = [[UILabel alloc] init];
label.text = string;
label.textColor = [UIColor whiteColor];
label.font = font;
CGRect frame = label.frame;
frame = CGRectMake(10, 10, 0, 85);
label.frame = frame;
CGContextRef contextRef = UIGraphicsGetCurrentContext();
[color setFill];
circle = CGRectMake(0, 0, radius, radius);
CGContextAddEllipseInRect(contextRef, circle);
CGContextDrawPath (contextRef, kCGPathFill);
[label drawRect:circle];
}
and my viewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
CGFloat radius = 70;
CGRect position = CGRectMake(0, 0, radius, radius);
Circle *myCircle = [[Circle alloc] initWithFrame:position radius:radius color:[UIColor redColor]];
[self.view addSubview:myCircle];
}
You should not be allocating new UIViews in drawRect: (and UILabel is a subclass of UIView). There are a few good ways of doing what you want, but none of them involve allocating a new UILabel in drawRect:.
One way is to make your Circle give itself a UILabel subview in its initializer, and center the label in layoutSubviews. Then in drawRect:, you just draw the circle and don't worry about drawing the label's text:
#implementation Circle {
UILabel *_label;
}
#synthesize radius = _radius;
#synthesize color = _color;
- (id)initWithFrame:(CGRect)frame radius:(CGFloat)aRadius color:(UIColor*) aColor {
self = [super initWithFrame:frame];
if (self) {
self.opaque = NO;
[self setRadius:aRadius];
[self setColor:aColor];
_label = [[UILabel alloc] init];
_label.font = [UIFont systemFontOfSize:80];
_label.textColor = [UIColor whiteColor];
_label.text = #"1";
[_label sizeToFit];
[self addSubview:_label];
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
CGSize mySize = self.bounds.size;
_label.center = CGPointMake(mySize.width * 0.5f, mySize.height * 0.5f);
}
- (void)drawRect:(CGRect)rect {
[self.color setFill];
CGSize mySize = self.bounds.size;
CGFloat radius = self.radius;
[[UIBezierPath bezierPathWithOvalInRect:CGRectMake(mySize.width * 0.5f, mySize.height * 0.5f, self.radius, self.radius)] fill];
}
I am trying to display horizontal and/or vertical lines in a grid. So I created a UIView subclass GridLines that draws lines in drawRect:. I then create two of these (one vertical, one not), and add them as subviews to my primary view (Canvas) also UIView derived. The other custom subviews I add to Canvas are displayed, removed, etc. properly, but the GridLines objects are not, and their drawRect:s never get called. When I had this line-drawing code in [Canvas drawRect:] (which is now disabled), it displayed the grid properly.
Looking through similar questions, it seems most people with this issue are calling drawRect in a non-UIView derived class, but mine is a UIView.
Am I missing something here?
GridLines.h:
#import <UIKit/UIKit.h>
#interface GridLines : UIView
{
BOOL mVertical;
}
- (id) initWithFrame: (CGRect) _frame vertical: (BOOL) _vertical;
#end
GridLines.m:
#import "GridLines.h"
#implementation GridLines
- (id) initWithFrame: (CGRect) _frame vertical: (BOOL) _vertical
{
if ((self = [super initWithFrame: _frame]))
{
mVertical = _vertical;
}
return self;
}
- (void) drawRect: (CGRect) _rect
{
NSLog(#"[GridLines drawRect]");
CGContextRef context = UIGraphicsGetCurrentContext();
[[UIColor clearColor] set];
UIRectFill([self bounds]);
if (mVertical)
{
for (int i = 50; i < self.frame.size.width; i += 50)
{
CGContextBeginPath(context);
CGContextMoveToPoint(context, (CGFloat)i, 0.0);
CGContextAddLineToPoint(context, (CGFloat)i, self.frame.size.height);
[[UIColor grayColor] setStroke];
CGContextSetLineWidth(context, 1.0);
CGContextDrawPath(context, kCGPathFillStroke);
}
}
else
{
for (int j = 50; j < self.frame.size.height; j += 50)
{
CGContextBeginPath(context);
CGContextMoveToPoint(context, 0.0, (CGFloat)j);
CGContextAddLineToPoint(context, self.frame.size.width, (CGFloat)j);
[[UIColor grayColor] setStroke];
CGContextSetLineWidth(context, 1.0);
CGContextDrawPath(context, kCGPathFillStroke);
}
}
}
#end
In another UIView derived class:
- (void) createGrids
{
mHorizontalLines = [[GridLines alloc] initWithFrame: self.frame vertical: NO];
mVerticalLines = [[GridLines alloc] initWithFrame: self.frame vertical: YES];
[self addSubview: mHorizontalLines];
[self addSubview: mVerticalLines];
}
You may have a frame v bounds problem.
mHorizontalLines = [[GridLines alloc] initWithFrame: self.frame vertical: NO];
mVerticalLines = [[GridLines alloc] initWithFrame: self.frame vertical: YES];
frame is kept in superview's co-ordinate space, if self.frame is offset more that it is wide, when you set these new views to that frame, they'll be clipped to rect of self.
try changing this to self.bounds, which should have origin = {0,0}
I have an app that displays custom maps. I use a CATiledView to display the maps.
I would like to be able to draw a route over the top of the maps. To do this, I am creating a UIView then adding it to the scrollView after I add the tiling layer like this:
- (void)displayTiledImageNamed:(NSString *)imageName size:(CGSize)imageSize
{
// clear the previous imageView
[imageView removeFromSuperview];
[imageView release];
imageView = nil;
[linesView removeFromSuperview];
[linesView release];
linesView = nil;
// reset our zoomScale to 1.0 before doing any further calculations
self.zoomScale = 1.0;
// make a new TilingView for the new image
imageView = [[TilingView alloc] initWithImageName:imageName size:imageSize];
linesView = [[LinesView alloc]initWithImageName:imageName size:imageSize];
linesView.backgroundColor = [UIColor clearColor];
[self addSubview:imageView];
[self addSubview:linesView];
[self configureForImageSize:imageSize];
}
The problem, is the line that I create in linesView is not scaling correctly.
It's hard to describe, but the line that is being created is scaled as if it were drawn on the device itself, rather than drawn on the map. See the following code:
#import "LinesView.h"
#implementation LinesView
#synthesize imageName;
- (id)initWithImageName:(NSString *)name size:(CGSize)size
{
if ((self = [super initWithFrame:CGRectMake(0, 0, size.width, size.height)])) {
self.imageName = name;
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1, 0, 0, 1);
CGContextSetLineWidth(context, 20.0);
CGContextMoveToPoint(context, 1.0f, 220.0f);
CGContextAddLineToPoint(context, 340.0f, 80);
CGContextStrokePath(context);
}
#end
I have tried putting the code to draw the line in the drawRect method of the tilingView and it works perfectly. The line width is 20px relative to the map. In the linesView the line appears to be 20px wide relative to the device and positioned relative to the scrollview.
Sorry I'm trying my best to describe the problem...
Figured this out - I added the linesView to the tilingView instead of the scrollView like this:
- (void)displayTiledImageNamed:(NSString *)imageName size:(CGSize)imageSize
{
// clear the previous imageView
[imageView removeFromSuperview];
[imageView release];
imageView = nil;
[linesView removeFromSuperview];
[linesView release];
linesView = nil;
// reset our zoomScale to 1.0 before doing any further calculations
self.zoomScale = 1.0;
// make a new TilingView for the new image
imageView = [[TilingView alloc] initWithImageName:imageName size:imageSize];
linesView = [[LinesView alloc]initWithImageName:imageName size:imageSize];
linesView.backgroundColor = [UIColor clearColor];
[self addSubview:imageView];
[imageView addSubview:linesView];
[self configureForImageSize:imageSize];
}
I have a UITextView where the user can create notes and save into a plist file.
I want to be able to show lines just like a normal notebook. The problem I have is
that the text won't align properly.
The image below explains the problem quite well.
This is the background I use to create the lines like the Notes.app
This is my code for creating the background for my UITextView:
textView.font = [UIFont fontWithName:#"MarkerFelt-Thin" size:19.0];
textView.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed: #"Notes.png"]];
I know that the UIFont.lineHeight property is only available in > iOS 4.x.
So I wonder if there is another solution to my problem?
You should try and draw your lines programmatically rather than using an image. Here's some sample code of how you could accomplish that. You can subclass UITextView and override it's drawRect: method.
NoteView.h
#import <UIKit/UIKit.h>
#interface NoteView : UITextView <UITextViewDelegate> {
}
#end
NoteView.m
#import "NoteView.h"
#implementation NoteView
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.backgroundColor = [UIColor colorWithRed:1.0f green:1.0f blue:0.6f alpha:1.0f];
self.font = [UIFont fontWithName:#"MarkerFelt-Thin" size:19];
}
return self;
}
- (void)drawRect:(CGRect)rect {
//Get the current drawing context
CGContextRef context = UIGraphicsGetCurrentContext();
//Set the line color and width
CGContextSetStrokeColorWithColor(context, [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.2f].CGColor);
CGContextSetLineWidth(context, 1.0f);
//Start a new Path
CGContextBeginPath(context);
//Find the number of lines in our textView + add a bit more height to draw lines in the empty part of the view
NSUInteger numberOfLines = (self.contentSize.height + self.bounds.size.height) / self.font.leading;
//Set the line offset from the baseline. (I'm sure there's a concrete way to calculate this.)
CGFloat baselineOffset = 6.0f;
//iterate over numberOfLines and draw each line
for (int x = 0; x < numberOfLines; x++) {
//0.5f offset lines up line with pixel boundary
CGContextMoveToPoint(context, self.bounds.origin.x, self.font.leading*x + 0.5f + baselineOffset);
CGContextAddLineToPoint(context, self.bounds.size.width, self.font.leading*x + 0.5f + baselineOffset);
}
//Close our Path and Stroke (draw) it
CGContextClosePath(context);
CGContextStrokePath(context);
}
#end
MyViewController.h
#import <UIKit/UIKit.h>
#import "NoteView.h"
#interface MyViewController : UIViewController <UITextViewDelegate> {
NoteView *note;
}
#property (nonatomic, retain) NoteView *note;
#end
MyViewController.m
#import "MyViewController.h"
#import "NoteView.h"
#define KEYBOARD_HEIGHT 216
#implementation MyViewController
#synthesize note;
- (void)loadView {
[super loadView];
self.note = [[[NoteView alloc] initWithFrame:self.view.bounds] autorelease];
[self.view addSubview:note];
note.delegate = self;
note.text = #"This is the first line.\nThis is the second line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\nThis is the ... line.\n";
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
[note setNeedsDisplay];
}
- (void)textViewDidBeginEditing:(UITextView *)textView {
CGRect frame = self.view.bounds;
frame.size.height -= KEYBOARD_HEIGHT;
note.frame = frame;
}
- (void)textViewDidEndEditing:(UITextView *)textView {
note.frame = self.view.bounds;
}
- (void)dealloc {
[note release];
[super dealloc];
}
Take a look at Apple's documentation for Managing the Keyboard, specifically "Moving Content That Is Located Under the Keyboard". It explains how to listen for NSNotifcations and adjust your views properly.
I think the problem is with your image, the yellow space over the line is creating the problem.
You should edit the image.
And nice work.