在开发中遇到了一个需求就是动态修改footerView的高度，footerView的高度随着用户输入内容的变化，改变输入框的高度，并且改变footerView的高度，通常情况下我们会直接创建footerView,并且给footer一个frame,但是如果想动态修改footerView的高度，或者让footerView高度自适应，我们就需要需改footerView的高度，并且重新赋值给tableView
CGRect newFrame = viewHeader.frame;
newFrame.size.height = newFrame.size.height + webView.frame.size.height;
viewHeader.frame = newFrame;
[self.tableView setTableHeaderView: viewHeader];
@interface ETCAuditViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,strong)UITableView *mineTableView;
@property(nonatomic,strong)AuditFooterView *footerView;
@end
@implementation ETCAuditViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = AppLocalString(@"bulk_task_list_query");
self.edgesForExtendedLayout = UIRectEdgeNone;
[self.view addSubview:self.mineTableView];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeFooterViewHeight:) name:@"changeHeight" object:nil];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
AuditTableViewCell *cell = [AuditTableViewCell cellWithTableView:tableView];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 10;
}
- (UITableView *)mineTableView{
if (!_mineTableView) {
if (kDevice_iPhoneX) {
_mineTableView = [[BaseTableView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-TotaliPhoneX) style:UITableViewStylePlain];
NSLog(@"SCREEN_HEIGHT=%f TotaliPhoneX = %f",SCREEN_HEIGHT,TotaliPhoneX);
}else{
_mineTableView = [[BaseTableView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH,SCREEN_HEIGHT-NAVIGATION_BAR_HEIGHT) style:UITableViewStylePlain];
}
_mineTableView.backgroundColor = TableViewBackColor;
_mineTableView.delegate = self;
_mineTableView.dataSource = self;
_mineTableView.rowHeight = UITableViewAutomaticDimension;
_mineTableView.separatorColor = [UIColor whiteColor];
_mineTableView.estimatedRowHeight = 160;
AuditHeaderView *headerView = [[AuditHeaderView alloc] init];
headerView.frame = CGRectMake(0, 0, SCREEN_WIDTH, 30);
_mineTableView.tableHeaderView = headerView;
self.footerView = [[AuditFooterView alloc] init];
_footerView.frame = CGRectMake(0, 0, SCREEN_WIDTH, 120);
_mineTableView.tableFooterView = _footerView;
}
return _mineTableView;
}
- (void)changeFooterViewHeight:(NSNotification *)note{
NSDictionary *dic = note.userInfo;
CGFloat totalHeight = [dic[@"totalHeight"] floatValue];
self.footerView.frame = CGRectMake(0, 0, SCREEN_WIDTH, totalHeight);
[self.mineTableView.tableFooterView setNeedsLayout];
self.mineTableView.tableFooterView = self.footerView;
}
自定义footerView内部
#import "AuditFooterView.h"
@interface AuditFooterView()<UITextViewDelegate>
{
CGFloat _initHeight;
}
@end
@implementation AuditFooterView
- (instancetype)init{
self = [super init];
if (self) {
self = [[[NSBundle mainBundle] loadNibNamed:@"AuditFooterView" owner:self options:nil] lastObject];
self.opinion.delegate = self;
_initHeight = 30;
self.opinion.layer.borderColor = [UIColor greenColor].CGColor;
self.opinion.layer.borderWidth = 1.0f;
self.opinion.textContainerInset = UIEdgeInsetsMake(2, 0, 0, 0);
}
return self;
}
- (void)awakeFromNib{
[super awakeFromNib];
}
/** textView文本内容改变时回调 */
- (void)textViewDidChange:(UITextView *)textView{
// 计算高度
CGSize size = CGSizeMake(self.opinion.frame.size.width, CGFLOAT_MAX);
NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:self.opinion.font,NSFontAttributeName, nil];
CGFloat curheight = [textView.text boundingRectWithSize:size
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:dic
context:nil].size.height;
// 如果高度小于初始化时的高度，则不赋值(仍采用最初的高度)
if (curheight < _initHeight) {
// self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, _initHeight);
// self.opinion.frame = CGRectMake(self.opinion.frame.origin.x, self.opinion.frame.origin.y, self.opinion.frame.size.width, _initHeight);
self.textViewHeight.constant = _initHeight;
CGFloat totalHeight = 120;
[[NSNotificationCenter defaultCenter] postNotificationName:@"changeHeight" object:nil userInfo:@{@"totalHeight":[NSString stringWithFormat:@"%f",totalHeight]}];
}else{
// 重新给frame赋值(改变高度)
// self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, curheight+20);
// self.opinion.frame = CGRectMake(self.opinion.frame.origin.x, self.opinion.frame.origin.y, self.opinion.frame.size.width, curheight+20);
self.textViewHeight.constant = curheight+20;
CGFloat totalHeight = 120 + curheight - 30;
[[NSNotificationCenter defaultCenter] postNotificationName:@"changeHeight" object:nil userInfo:@{@"totalHeight":[NSString stringWithFormat:@"%f",totalHeight]}];
}
// // 如果文本为空，显示placeholder
// if (textView.text.length == 0) {
// self.placeholderLabel.hidden = NO;
// self.placeholderLabel.center = self.textView.center;
// }else{
// self.placeholderLabel.hidden = YES;
// }
}
@end
