消除重复不连续的字符 aabcad 得aabcd

NSString* str =@"aabcad";

NSMutableArray* cArr =@[].mutableCopy;

for(int i =0; i < str.length; i++) {

[cArr addObject:[str substringWithRange:NSMakeRange(i,1)]];}

NSMutableArray* deArr =@[].mutableCopy;

for(int i =0; i < cArr.count; i++) {

for(int j =0; j < cArr.count; j++) {

if([cArr[i] isEqualToString:cArr[j]] && i!=j) {

if(i ==0) {

if(![cArr[i] isEqualToString:cArr[i+1]]) {

[deArr addObject:@(i)];

break;}}

if(i >0&& i < cArr.count-1){

if(![cArr[i] isEqualToString:cArr[i+1]] && ![cArr[i] isEqualToString:cArr[i-1]]) {

[deArr addObject:@(i)];

break;}}

if(i == cArr.count-1) {

if(![cArr[i] isEqualToString:cArr[i-1]]) {

[deArr addObject:@(i)];

break;}}

}

}

}

for(int i = (int)deArr.count-1; i >=0; i--) {

[cArr removeObjectAtIndex:[deArr[i] integerValue]];

}

NSString* newStr = [cArr componentsJoinedByString:@""];

NSLog(@"%@",str);

NSLog(@"%@",newStr);