我尝试使用flashScrollIndicators方法在视图出现时至少闪烁scrollBar指示符，我试图直接调用它，并将其定义为函数并调用它，似乎没有任何工作。我错过了什么？！
我有一个名为scroll1的ScrollView，其中包含一个subView，其中包含我需要在scrollBars上显示的textViews（leftTextView和rightTextView），这里是我的代码片段，以便进一步说明：
CGFloat x = counter * 1024;
subView = [[UIScrollView alloc]initWithFrame:CGRectMake(x, 0, 1024, 693)];
subView.clipsToBounds = NO;
UIImage *img;
UIImage *img2;
img = [imgs objectAtIndex:i];
img2 = [imgs objectAtIndex:i+1];
imageView = [[UIImageView alloc ] initWithImage:img];
imageView.frame = CGRectMake(i * 512, 0, 512, 693);
imageView2 = [[UIImageView alloc ] initWithImage:img2];
imageView2.frame = CGRectMake((i+1) * 512, 0, 512, 693);
rightTextView = [[UITextView alloc]init];
leftTextView = [[UITextView alloc]init];
[rightTextView setFont:[UIFont boldSystemFontOfSize:fontSize]];
rightTextView.editable = NO;
leftTextView.editable = NO;
rightTextView.layer.zPosition = 2;
// [leftTextView becomeFirstResponder];
leftTextView.layer.zPosition = 2;
// [self flashScrollIndicators];
if(i == 4) {
leftTextView.frame = CGRectMake(2090, 0, 500,300);
//[self flashScrollIndicators];
// [leftTextView flashScrollIndicators];
// NSLog(@"Z Position %f", leftTextView.layer.zPosition);
}
else if(i == 6){
leftTextView.frame = CGRectMake(3120, 450, 480,250);
rightTextView.frame = CGRectMake(3584, 0, 500,200);
}
else if(i==8){
leftTextView.frame = CGRectMake(4144, 0, 470,280);
rightTextView.frame = CGRectMake(4608, 450, 500,220);
}
else if(i==10){
leftTextView.frame = CGRectMake(5168, 0, 500,300);
rightTextView.frame = CGRectMake(5646, 0, 480,300);
}
else if(i==12){
leftTextView.frame = CGRectMake(6192, 0, 470,300);
rightTextView.frame = CGRectMake(6638, 430, 500,250);
}
else if(i==14) {
leftTextView.frame = CGRectMake(7216, 420, 430,280);
rightTextView.frame = CGRectMake(7680, 0, 500,280);
}
else if(i==16) {
leftTextView.frame = CGRectMake(8240, 0, 470,300);
rightTextView.frame = CGRectMake(8674, 0, 500,400);
}
else if(i==18){
leftTextView.frame = CGRectMake(9264, 410, 470,280);
rightTextView.frame = CGRectMake(9728, 0, 500,250);
}
else if(i==20){
leftTextView.frame = CGRectMake(10260, 320, 470,350);
rightTextView.frame = CGRectMake(10752, 450, 500,300);
}
else if(i==22){
leftTextView.frame = CGRectMake(11312, 0, 500,300);
rightTextView.frame = CGRectMake(11776, 0, 500,300);
}
rightTextView.backgroundColor = [UIColor clearColor];
rightTextView.textColor = [UIColor blackColor];
// rightTextView.scrollIndicatorInsets = UIScrollViewIndicatorStyleWhite ;
[rightTextFieldsArray addObject:rightTextView];
leftTextView.backgroundColor = [UIColor clearColor];
leftTextView.textColor = [UIColor blackColor];
// leftTextView.text = leftArray[i/2];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineHeightMultiple = 32.0f;
paragraphStyle.maximumLineHeight = 32.0f;
paragraphStyle.minimumLineHeight = 32.0f;
// NSString *string = @"if you want reduce or increase space between lines in uitextview ,you can do this with this,but donot set font on this paragraph , set this on uitextveiw.";
NSDictionary *ats = @{
NSParagraphStyleAttributeName : paragraphStyle,
};
// [lefTextView setFont:[uifont fontwithname:@"Arial" size:20.0f]];
leftTextView.attributedText = [[NSAttributedString alloc] initWithString:leftArray[i/2] attributes:ats];
[leftTextView setFont:[UIFont boldSystemFontOfSize:fontSize]];
rightTextView.attributedText = [[NSAttributedString alloc] initWithString:rightArray[i/2] attributes:ats];
[rightTextView setFont:[UIFont boldSystemFontOfSize:fontSize]];
// [leftTextView flashScrollIndicators];
[leftTextFieldsArray addObject:leftTextView];
subView.scrollEnabled = NO;
subView.userInteractionEnabled = NO;
[subView addSubview:imageView];
[imageView2 removeFromSuperview];
// [leftTextView removeFromSuperview];
[self.scroll1 addSubview:leftTextView];
[self.scroll1 addSubview:rightTextView];
[self.scroll1 addSubview:subView];