我们说我有3条文字。我想使用UITextView来显示它。我有一个下一个和上一个按钮，以帮助我循环它。什么是解决这个问题的最佳方法？我正在尝试一些代码..但它不适合我.. 实际上我需要显示如下： 如果我点击下一个按钮我需要显示如下。第1页和第3页第3页和第3页第3页。如果我点击后退按钮我需要显示如下。第3页，共3页第2页，共3页和第3页1 of 3。
-(void)btnClicked:(UIButton*)btn
{
int totalcount=3;
if(slokaText.hidden==NO)
{
if (btn.tag==1)
{
NSLog(@"%lu", (unsigned long)[textStr count]);
if (counter<[textStr count]-1) {
counter++;
NSLog(@"%i", counter);
descriptionLbl1.text= [NSString stringWithFormat:@"%@", [textStr objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
else
{
if (counter>1)
{
counter--;
descriptionLbl1.text= [NSString stringWithFormat:@"%@", [textStr objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
}
else if (slokaMeaning.hidden==NO)
{
if (btn.tag==1)
{
NSLog(@"%lu", (unsigned long)[textStr1 count]);
if (counter<[textStr1 count]-1) {
counter++;
NSLog(@"%i", counter);
descriptionLbl2.text= [NSString stringWithFormat:@"%@", [textStr1 objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
else
{
if (counter>1)
{
counter--;
descriptionLbl2.text= [NSString stringWithFormat:@"%@", [textStr1 objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
}
else if (meaning.hidden==NO)
{
if (btn.tag==1)
{
NSLog(@"%lu", (unsigned long)[textStr2 count]);
if (counter<[textStr2 count]-1)
{
counter++;
NSLog(@"%i", counter);
descriptionLbl3.text= [NSString stringWithFormat:@"%@", [textStr2 objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
else
{
if (counter>1)
{
counter--;
descriptionLbl3.text= [NSString stringWithFormat:@"%@", [textStr2 objectAtIndex:counter]];
NSLog(@"counter is :%d",counter);
countLabel.text=[NSString stringWithFormat:@"page %d of %d",counter,totalcount];
}
}
}
}
答案 0 :(得分：0)
假设currentPageNum，totalPageNum，yourTextView被声明为全局变量
- (IBAction)yourButtonAction:(UIButton *)sender
{
if (sender.tag == 1) // assumed as back action
{
if (currentPageNum > 0)
{
currentPageNum -- ;
}
else
{
currentPageNum = totalPageNum; // add this line if you want to cycle
}
}
else // assumed as next action
{
if (currentPageNum < totalPageNum)
{
currentPageNum ++;
}
else
{
currentPageNum = 1; // add this line if you want to cycle
}
}
yourTextView.text = [NSString stringWithFormat:@"Page %li of %li",(long)currentPageNum,(long)totalPageNum];
}