How to generate random letters as per the word - ios

Question

I’m developing word puzzle game,where one word is given.according to that word the random letters are generated…for that, i applied below logic but some how the random letters not generated as per the given word.
NSMutableArray *ArrOfABCD = [[NSMutableArray alloc]
initWithObjects:#"A",#"B",#"C",#"D",#"E",#"F",#"G",#"H",#"I",#"J",#"K",#"L",#"M",#"N",#"O",#"P",#"Q",#"R",#"S",#"T",#"U",#"V",#"W",#"X",#"Y",#"Z",
nil];
float x = 70;
float y = 100;
float width = 30;
float height = 20;
for(int i =0;i<32;i++)
{
NSUInteger randomIndex = arc4random() %(ArrOfABCD.count);
UIButton *btnLetter = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btnLetter setFrame:CGRectMake(x, y, width, height)];
[btnLetter setTitle:[NSString stringWithFormat:#"%#",ArrOfABCD[randomIndex]]
forState:UIControlStateNormal];
[self.view addSubview:btnLetter];
x = x + width + 30;
if((i+1)%4==0)
{
x = 70;
y = y + height + 20;
}
}
can any one suggest me that where i made mistake?

Answer 1

You should generate the unique random number
NSMutableArray* ArrOfWords = [[NSMutableArray alloc] initWithObjects:#"Good",#"Home",#"Beauty",#"Good",nil];
NSMutableArray *ArrOfABCD = [[NSMutableArray alloc] initWithObjects:#"A",#"B",#"C",#"D",#"E",#"F",#"G",#"H",#"I",#"J",#"K",#"L",#"M",#"N",#"O",#"P",#"Q",#"R",#"S",#"T",#"U",#"V",#"W",#"X",#"Y",#"Z", nil];
NSMutableArray *arrDuplicate=[[NSMutableArray alloc]init];
float x = 70;
float y = 100;
float width = 30;
float height = 20;
NSInteger rowIndex=4;
NSString *dataString=[ArrOfWords objectAtIndex:0];
NSMutableArray *arrNumber = [[NSMutableArray alloc]init];
for (int i = 0; i < [dataString length]; i++) {
NSInteger index=arc4random_uniform(rowIndex)+rowIndex;
NSNumber *number=[NSNumber numberWithInt:index];
while ([arrDuplicate containsObject:number] ) {
NSInteger index=arc4random_uniform(rowIndex)+rowIndex;
number=[NSNumber numberWithInt:index];
}
[arrNumber addObject:number];
[arrDuplicate addObject:number];
}
[arrDuplicate removeAllObjects];
NSMutableArray *arrayChar = [NSMutableArray array];
for (int i = 0; i < [dataString length]; i++) {
[arrayChar addObject:[NSString stringWithFormat:#"%C", [dataString characterAtIndex:i]]];
}
for(int i =0;i<32;i++)
{
NSString *str=[ArrOfABCD objectAtIndex:arc4random_uniform(ArrOfABCD.count)];
if ([arrNumber containsObject:[NSNumber numberWithInt:i]] ) {
str=[arrayChar objectAtIndex:arrDuplicate.count];
[arrDuplicate addObject:str];
}
NSLog(#"%#",str);
UIButton *btnLetter = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btnLetter setFrame:CGRectMake(x, y, width, height)];
[btnLetter setTitle:str forState:UIControlStateNormal];
x = x + width + 30;
if((i+1)%4==0)
{
x = 70;
y = y + height + 20;
}
}