How to set text to UILabel from Button click in different views - ios

Question

Hi everyone iam new in objective c, now i try to create the app like "What's the word". I find this tutorial and lerned it as well as i can. But i have some problems. I want when i click on buttons the currentTitle replace the lable in placesView. Button click method in LettersView.m named as "displayChar". I have success in getting currentTitle but now i don't know how to pass it to GameController and paste text on "places".
I will be grateful for any help!
Here is my code
LettersView.h
#import <UIKit/UIKit.h>
#class LettersView;
#protocol LetterClickDelegateProtocol <NSObject>
-(void)letterView:(LettersView*)letterView addChar:(NSString *)addChar;
#end
#interface LettersView : UIImageView
#property (strong, nonatomic, readonly) NSString* letter;
#property (assign, nonatomic) BOOL isMatched;
#property (strong, nonatomic) NSString *clickLetter;
#property (weak, nonatomic) id<LetterClickDelegateProtocol> clickDelegate;
#property (strong, nonatomic) UIButton *lblChar;
-(instancetype)initWithLetter:(NSString*)letter andSideLength:(float)sideLength;
#end
LettersView.m
#import "LettersView.h"
#import "config.h"
#implementation LettersView{
NSInteger _xOffset, _yOffset;
}
- (id)initWithFrame:(CGRect)frame
{
NSAssert(NO, #"Use initWithLetter:andSideLength instead");
return nil;
}
-(instancetype)initWithLetter:(NSString*)letter andSideLength:(float)sideLength
{
//the letter background
UIImage* img = [UIImage imageNamed:#"btn_letter#2x.png"];
//create a new object
self = [super initWithImage:img];
if (self != nil) {
//resize the letters
float scale = sideLength/img.size.width;
self.frame = CGRectMake(0,0,img.size.width*scale, img.size.height*scale);
UIButton *lblChar = [[UIButton alloc] initWithFrame:self.bounds];
lblChar.tintColor = [UIColor blackColor];
lblChar.backgroundColor = [UIColor clearColor];
[lblChar setTitle:letter forState:UIControlStateNormal];
[lblChar addTarget:self action:#selector(displaychar:)forControlEvents:UIControlEventTouchUpInside];
[self addSubview:lblChar];
self.isMatched = NO;
_letter = letter;
self.userInteractionEnabled = YES;
}
return self;
}
-(void)displayChar:(id)sender {
UIButton *lblChar = (UIButton *)sender;
NSLog(#" The button's title is %#.", lblChar.currentTitle);
_clickLetter = lblChar.currentTitle;
if (self.clickDelegate) {
[self.clickDelegate letterView:self addChar:lblChar.currentTitle];
}
NSLog(#"hu %#", _clickLetter);
}
PlacesView.h
// PlacesView.m
#import "PlacesView.h"
#import "config.h"
#implementation PlacesView
-(id)initWithFrame:(CGRect)frame {
NSAssert(NO, #"Use initwithletter");
return nil;
}
-(instancetype)initWithLetter:(NSString *)letter andSideLength:(float)sideLength
{
UIImage *img = [UIImage imageNamed:#"btn_input#2x.png"];
self = [super initWithImage: img];
if (self != nil) {
self.isMatched = NO;
float scale = sideLength/img.size.width;
self.frame = CGRectMake(0, 0, img.size.width*scale, img.size.height*scale);
//bullshit time
_fieldForLetter = [[UILabel alloc] initWithFrame:self.bounds];
_fieldForLetter.textAlignment = NSTextAlignmentCenter;
_fieldForLetter.textColor = [UIColor blackColor];
_fieldForLetter.backgroundColor = [UIColor clearColor];
_fieldForLetter.text = #"*"; // if button pressed button title placed here.
[self addSubview:_fieldForLetter];
_letter = letter;
}
return self;
}
#end
GameController.m
#import "GameController.h"
#import "config.h"
#import "LettersView.h"
#import "PlacesView.h"
#import "AppDelegate.h"
#implementation GameController {
//tile lists
NSMutableArray* _letters;
NSMutableArray* _places;
}
-(instancetype)init {
self = [super init];
if (self != nil) {
self.points = [[PointsController alloc] init];
self.audioController = [[AudioController alloc] init];
[self.audioController preloadAudioEffects: kAudioEffectFiles];
}
return self;
}
-(void)dealRandomWord {
NSAssert(self.level.words, #"Level not loaded");
// random word from plist
NSInteger randomIndex = arc4random()%[self.level.words count];
NSArray* anaPair = self.level.words[ randomIndex ];
NSString* word1 = anaPair[1]; // answer
NSString* word2 = anaPair[2]; // some letters
_helpstr = anaPair[3]; // helper
NSLog(#"qweqweq %# %#" , word1 , word2);
NSInteger word1len = [word1 length];
NSInteger word2len = [word2 length];
NSLog(#"phrase1[%li]: %#", (long)word1len, word1);
NSLog(#"phrase2[%li]: %#", (long)word2len, word2);
//calculate the letter size
float letterSide = ceilf( kScreenWidth*0.9 / (float)MAX(word1len, word2len) ) - kTileMargin;
//get the left margin for first letter
float xOffset = (kScreenWidth - MAX(word1len, word2len) * (letterSide + kTileMargin))/2;
//adjust for letter center
xOffset += letterSide/2;
float yOffset = 1.5* letterSide;
// init places list
_places = [NSMutableArray arrayWithCapacity: word1len];
// create places
for (NSInteger i = 0; i<word1len; i++){
NSString *letter = [word1 substringWithRange:NSMakeRange(i, 1)];
if (![letter isEqualToString:#" "]) {
PlacesView* place = [[PlacesView alloc] initWithLetter:letter andSideLength:letterSide];
place.center = CGPointMake(xOffset + i*(letterSide + kTileMargin), kScreenHeight/4);
[self.gameView addSubview:place];
[_places addObject: place];
}
}
//init letters list
_letters = [NSMutableArray arrayWithCapacity: word2len];
//create letter
for (NSInteger i=0;i<word2len;i++) {
NSString* letter = [word2 substringWithRange:NSMakeRange(i, 1)];
if (![letter isEqualToString:#" "]) {
LettersView* letv = [[LettersView alloc] initWithLetter:letter andSideLength:letterSide];
letv.center = CGPointMake(xOffset + i * (letterSide + kTileMargin), kScreenHeight); // "/3*4"
if (i > 6) {
letv.center = CGPointMake(-5.15 * xOffset + i * (letterSide + kTileMargin), kScreenHeight + yOffset); // "/3*4"
}
letv.clickDelegate = self;
[self.gameView addSubview:letv];
[_letters addObject: letter];
}
}
}
-(void)letterView:(LettersView *)letterView addChar:(NSString *)addChar
{
PlacesView* placesView = nil;
for (PlacesView* pl in _places) {
//if (CGRectContainsPoint(pl.frame, pt)) {
if () {
//placesView = pl;
placesView.fieldForLetter.text = letterView.lblChar.currentTitle;
break;
}
}
//1 check if target was found
if (placesView!=nil) {
//2 check if letter matches
if ([placesView.letter isEqualToString: letterView.letter]) {
[self placeLetter:letterView atTarget:placesView];
[self.audioController playEffect: kSoundLetterTap];
self.points.points += self.level.coinsPerLvl; //ne nado tak
NSLog(#"Current points %d" , self.points.points);
[self checkForSuccess];
} else {
[self.audioController playEffect:kSoundFail];
[self addAlert:#"ne success" andMessage:#"You lose!" andButton:#"eshe cyka"];
}
}
}
-(void)placeLetter:(LettersView*)letterView atTarget:(PlacesView*)placeView {
placeView.isMatched = YES;
letterView.isMatched = YES;
letterView.userInteractionEnabled = NO;
}
-(void)checkForSuccess {
for (PlacesView* p in _places) {
//no success, bail out
if (p.isMatched==NO) return;
}
NSLog(#"ya!");
[self addAlert:#"Success" andMessage:#"You win!" andButton:#"eshe cyka"];
[self.audioController playEffect:kSoundSuccess];
}
-(void)addAlert: (NSString *)addTitle andMessage: (NSString *)alertMessage andButton: (NSString *)alertButton {
dispatch_async(dispatch_get_main_queue(), ^{
UIWindow* window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
window.rootViewController = [UIViewController new];
window.windowLevel = UIWindowLevelAlert + 1;
UIAlertController *alert = [UIAlertController alertControllerWithTitle: addTitle message:alertMessage preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *defaultAction= [UIAlertAction actionWithTitle:alertButton style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
window.hidden = YES;
}];
[alert addAction:defaultAction];
[window makeKeyAndVisible];
[window.rootViewController presentViewController:alert animated:YES completion:nil];
});
}
#end

Answer 1

Your GameController needs to keep a reference to PlacesView. It can also assign the action into LettersView so when the button in LettersView is pressed, the GameController will fetch it and perform an action in PlacesView. GameController is what both the other classes have in common, so it can handle any actions between them.
Another option is to use NSNotificationCenter and post a message in LettersView when the button is pressed, and listen for it in PlacesView.
Yet anther way is using a delegates where GameController makes sure that PlacesView is set as the delegate. When LettersView's button is pressed, it will call the delegate method which PlacesView listens to.
I'd go with first option.