iOS TextView在TableviewCell中自动增加高度

原创Blog，转载请注明出处

http://blog.csdn.net/hello_hwc?viewmode=list

我的stackoverflow





前言:来自自己的一个StackOverFlow答案

效果

设置Cell的AutoLayout

这里要注意的是，添加了一个高度Constraint，这个Constraint是>=50的

SelfSizingCell.m

@interface SelfSizingCell ()<UITextViewDelegate>

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *heightConstraint;

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

@end
@implementation SelfSizingCell

- (void)awakeFromNib {
// Initialization code
self.textview.delegate = self;
self.textview.scrollEnabled = false;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];

// Configure the view for the selected state
}
-(void)textViewDidChange:(UITextView *)textView{
CGSize size = [textView sizeThatFits:CGSizeMake(CGRectGetWidth(self.frame), CGFLOAT_MAX)];
CGFloat height = size.height;
if (height < 50) {
self.heightConstraint.constant = 50;
}else{
self.heightConstraint.constant = height;
}
[self.tableView beginUpdates];
[self.tableView endUpdates];
}
@end

SelfSizingCell.h

@interface SelfSizingCell : UITableViewCell

@property (weak,nonatomic)UITableView * tableView;

@end

TableviewController

@implementation TableViewController

- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView registerNib:[UINib nibWithNibName:@"SelfSizingCell" bundle:nil] forCellReuseIdentifier:@"cell"];
self.tableView.estimatedRowHeight = 50;
self.tableView.rowHeight = UITableViewAutomaticDimension;
self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
}
#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 1;
}

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