iOS 8：【转】iOS UITextView 输入内容实时更新 cell 的高度

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#import <UIKit/UIKit.h>

@interface TextViewCell : UITableViewCell

@property (weak, nonatomic) IBOutlet UITextView *textView;

@end

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#import "TableViewController.h"
#import "TextViewCell.h"

@interface TableViewController ()

@property (nonatomic, strong) NSArray *data;

@end

@implementation TableViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  //  支持自适应 cell
  self.tableView.estimatedRowHeight = 100;
  self.tableView.rowHeight = UITableViewAutomaticDimension;

  self.data = @[@"Cell 1 ", @"Cell 2", @"Cell 3", @"Cell 4", @"Cell 5", @"Cell 6", @"Cell 7", @"Cell 8"];
}

#pragma mark - Table view data source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
  return [self.data count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  TextViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TextViewCell" forIndexPath:indexPath];
  cell.textView.text = self.data[indexPath.row];
  return cell;
}

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#import "TextViewCell.h"

@implementation TextViewCell

- (void)textViewDidChange:(UITextView *)textView
{
  CGRect bounds = textView.bounds;

  // 计算 text view 的高度
  CGSize maxSize = CGSizeMake(bounds.size.width, CGFLOAT_MAX);
  CGSize newSize = [textView sizeThatFits:maxSize];
  bounds.size = newSize;

  textView.bounds = bounds;

  // 让 table view 重新计算高度
  UITableView *tableView = [self tableView];
  [tableView beginUpdates];
  [tableView endUpdates];
}

- (UITableView *)tableView
{
  UIView *tableView = self.superview;

  while (![tableView isKindOfClass:[UITableView class]] && tableView) {
    tableView = tableView.superview;
  }

  return (UITableView *)tableView;
}

@end

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#import <UIKit/UIKit.h>

@protocol TextViewCellDelegate;

@interface TextViewCell : UITableViewCell

@property (weak, nonatomic) IBOutlet UITextView *textView;

@property (weak, nonatomic) id<TextViewCellDelegate> delegate;

@end

@protocol TextViewCellDelegate <NSObject>

- (void)textViewCell:(TextViewCell *)cell didChangeText:(NSString *)text;

@end

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- (void)textViewDidChange:(UITextView *)textView
{
  if ([self.delegate respondsToSelector:@selector(textViewCell:didChangeText:)]) {
    [self.delegate textViewCell:self didChangeText:textView.text];
  }

  // 计算 text view 的高度
  ...
  // 让 table view 重新计算高度
  ...
}

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#pragma mark - TextViewCellDelegate

- (void)textViewCell:(TextViewCell *)cell didChangeText:(NSString *)text
{
  NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

  NSMutableArray *data = [self.data mutableCopy];
  data[indexPath.row] = text;
  self.data = [data copy];
}