实战字符拼接

id列表 eg:["1","2"]//字符串拼接

声明

@property (strong,nonatomic) NSMutableString *String;
Bool  isBtn = NO;

方法

-(void)setimage:(UIButton *)ban{
//判断长度 拼接中括号   []
if (self. String.length == 0) {
    [self String appendString:[NSString stringWithFormat:@"[]"]];
}


if( isBtn ==NO){ //取消数值
    isBtn =YES;
    
    //第一个值是多少
    int  fistNum= [[self. String substringWithRange:NSMakeRange(2,2)] intValue];
    //是否相等
    if ( istNum == btn.tag) {
        if (self.StrToAvc.length == 6) {//判断是否只有一个数值
              NSRange range = [String rangeOfString:[NSString stringWithFormat: @"\"%ld\"",(long)btn.tag]];
             [String  deleteCharactersInRange:range];
        }else{
        NSRange range = [String rangeOfString:[NSString stringWithFormat: @"\"%ld\",",(long)btn.tag]];
        [self.StrToAvc  deleteCharactersInRange:range];
    }

    }else{
        NSRange range = [self.StrToAvc rangeOfString:[NSString stringWithFormat: @",\"%ld\"",(long)btn.tag]];
        [self.StrToAvc  deleteCharactersInRange:range];
    }
    
}else{//增加数值
    isBtn=NO;
    if (self. String.length == 2) {

        [self. String insertString:[NSString stringWithFormat: @"\"%ld\"",(long)btn.tag] atIndex:self. String.length-1];
    }else{
//            [self. String appendString:[NSString stringWithFormat: @",\"%ld\"",(long)btn.tag]];
        
        [self. String insertString:[NSString stringWithFormat: @",\"%ld\"",(long)btn.tag] atIndex:self. String.length-1];
    }
}

}