A category for iOS 7 ensuring that UITextView cursor stays within the content area defined by its contentInset. This behavior is standard in iOS 8

UITextView+SDECursorVisibility.m

//
//  UITextView+SDECursorVisibility.m
//
//  Created by Samuel Défago on 29.10.14.
//

#import <UIKit/UIKit.h>

@interface UITextView (SDECursorVisibility)

+ (void)sde_enableCursorVisibility;

@end

static __attribute__ ((constructor)) void SDEEnableUITextViewCursorVisibilityConstructor(void)
{
    [UITextView sde_enableCursorVisibility];
}

@implementation UITextView (CursorVisibility)

+ (void)sde_enableCursorVisibility
{
    // Not needed on iOS 8
    if ([[NSProcessInfo processInfo] respondsToSelector:@selector(operatingSystemVersion)]) {
        return;
    }
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(sde_textViewDidChangeCursorPosition:)
                                                 name:UITextViewTextDidBeginEditingNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(sde_textViewDidChangeCursorPosition:)
                                                 name:UITextViewTextDidChangeNotification
                                               object:nil];
}

+ (void)sde_textViewDidChangeCursorPosition:(NSNotification *)notification
{
    NSAssert([notification.object isKindOfClass:[UITextView class]], @"Expect a text view");
    
    // Wait a little bit to have the most recent cursor position
    [notification.object performSelector:@selector(sde_scrollCursorToVisible) withObject:nil afterDelay:0.05];
}

- (void)sde_scrollCursorToVisible
{
    UIView *cursorView = self;
    while ([cursorView.subviews count] != 0) {
        cursorView = [cursorView.subviews firstObject];
    }
    
    static const CGFloat kCursorVisibilityMargin = 10.f;
    CGRect cursorViewFrameInTextView = [self convertRect:cursorView.bounds fromView:cursorView];
    CGRect enlargedCursorViewFrameInTextView = CGRectMake(CGRectGetMinX(cursorViewFrameInTextView) - kCursorVisibilityMargin,
                                                          CGRectGetMinY(cursorViewFrameInTextView) - kCursorVisibilityMargin,
                                                          CGRectGetWidth(cursorViewFrameInTextView) + 2 * kCursorVisibilityMargin,
                                                          CGRectGetHeight(cursorViewFrameInTextView) + 2 * kCursorVisibilityMargin);
    
    [UIView animateWithDuration:0.25 animations:^{
        [self scrollRectToVisible:enlargedCursorViewFrameInTextView animated:NO];
    }];
}

@end