如何让UITextView一直显示滚动条

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//头文件#import <UIKit/UIKit.h>@interface TextView : UIView<UITextViewDelegate>{    UITextView *boxText;}- (id)initWithFrame:(CGRect)frame withContext:(NSString *)text;@end//实现文件@implementation TextView/** @method UITextView自定义重写封装 @param frame 位置 @param text 视图文本 */- (id)initWithFrame:(CGRect)frame withContext:(NSString *)text{    self = [super initWithFrame:frame];    if (self) {        boxText = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];        boxText.delegate = self;        [boxText setText:text];        [boxText setTextColor:[UIColor whiteColor]];        [boxText setTextAlignment:UITextAlignmentLeft];        [boxText setBackgroundColor:[UIColor clearColor]];        [boxText setFont:[UIFont systemFontOfSize:15]];        [boxText setEditable:YES];        [self addSubview:boxText];        [boxText release];                [NSTimer scheduledTimerWithTimeInterval:0.4 target:self selector:@selector(run) userInfo:nil repeats:NO];    }    return self;}#pragma mark --视图移动后判断是否是UIImage，然后判断是否是竖滚动条设置让滚动条显示---(void)run{    [boxText setContentOffset:CGPointMake(0, 10) animated:NO];    for(UIView *img in [boxText subviews]){        if ([img isKindOfClass:[UIImageView class]] && img.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin){            [img setAlpha:1];        }    }}#pragma mark --滚动视图结束移动后判断是否是UIImage，然后判断是否是竖滚动条设置让滚动条显示---(void)scrollViewDidEndDecelerating:(UIScrollView *)sc{    for (UIView *img in [sc subviews]) {        if ([img isKindOfClass:[UIImageView class]] && img.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin){            [img setAlpha:1];        }    }}#pragma mark --禁止UITextView的选择和编辑--- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{    return NO;}@end