Scroll to bottom of UITextView erratic in iOS 7

Question

The following code will work fine in iOS < 7.0. In iOS 7 the scrolling will be choppy and erratic while the UITextView is updating. I\'m not sure if this is a bug in iO

Answer 1

This is obviously an iOS 7 bug. Here is a workaround until apple fixes it. The workaround is basically instantiates a UITextView by creating an NSTextStorage and NSLayoutManager from scratch. Apple must have forgotten to initialize something in UITextView initialization method. I filed a bug report and I hope you do too.

// ios7 bug fix
// check if the device is running iOS 7.0 or later
NSString *reqSysVer = @"7.0";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
BOOL osVersionSupported = ([currSysVer compare:reqSysVer  options:NSNumericSearch] != NSOrderedAscending);

if (osVersionSupported) {
    NSTextStorage* textStorage = [[NSTextStorage alloc] init];
    NSLayoutManager* layoutManager = [NSLayoutManager new];
    [textStorage addLayoutManager:layoutManager];
    NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:self.view.bounds.size];
    [layoutManager addTextContainer:textContainer];
    yourTextView = [[UITextView alloc] initWithFrame:someFrameForYourTextView
                                       textContainer:textContainer];
    // if using ARC, remove these 3 lines
    [textContainer release];
    [layoutManager release];
    [textStorage release];
}
else {
    yourTextView = [[UITextView alloc] initWithFrame:someFrameForYourTextView];
}