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融云技术支持
为输入框添加一个 UILabel，实现 Placeholder 效果，做好 UI 方面的处理。
1.会话页面添加 UILabel 属性
@property(nonatomic, strong) UILabel *placeholderLabel;
2.配置第一步中的 UILabel 对象
- (void)configPlaceholder { //初始化和设置 self.placeholderLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 180, 20)]; [self.chatSessionInputBarControl.inputTextView addSubview:self.placeholderLabel]; self.placeholderLabel.text = @"测试 Placeholder"; self.placeholderLabel.textColor = [UIColor grayColor]; self.placeholderLabel.userInteractionEnabled = YES; //添加点击手势 UITapGestureRecognizer *tapLabel = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapPlaceholderLabel)]; [self.placeholderLabel addGestureRecognizer:tapLabel]; } - (void)tapPlaceholderLabel { [self.chatSessionInputBarControl updateStatus:KBottomBarKeyboardStatus animated:YES]; }
3.在内容发生变化和点击发送后，设置 placeholder 效果的显示
- (void)inputTextView:(UITextView *)inputTextView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { //在内容发生变化和点击发送后，设置 placeholder 效果的显示 if ((range.location == 0 && [text isEqualToString:@""]) || [text isEqualToString:@" "]) { self.placeholderLabel.hidden = NO; } else { self.placeholderLabel.hidden = YES; } }
4.当撤回消息，点击“重新编辑”后，关闭 placeholder 效果的显示
- (void)didTapReedit:(RCMessageModel *)model { self.placeholderLabel.hidden = YES; [super didTapReedit:model]; }
效果图：
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融云技术支持
实现思路
为输入框添加一个 UILabel，实现 Placeholder 效果，做好 UI 方面的处理。
实现步骤
1.会话页面添加 UILabel 属性
2.配置第一步中的 UILabel 对象
- (void)configPlaceholder {
//初始化和设置
self.placeholderLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 180, 20)];
[self.chatSessionInputBarControl.inputTextView addSubview:self.placeholderLabel];
self.placeholderLabel.text = @"测试 Placeholder";
self.placeholderLabel.textColor = [UIColor grayColor];
self.placeholderLabel.userInteractionEnabled = YES;
//添加点击手势
UITapGestureRecognizer *tapLabel = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapPlaceholderLabel)];
[self.placeholderLabel addGestureRecognizer:tapLabel];
}
- (void)tapPlaceholderLabel {
[self.chatSessionInputBarControl updateStatus:KBottomBarKeyboardStatus animated:YES];
}
3.在内容发生变化和点击发送后，设置 placeholder 效果的显示
- (void)inputTextView:(UITextView *)inputTextView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {//在内容发生变化和点击发送后，设置 placeholder 效果的显示
if ((range.location == 0 && [text isEqualToString:@""]) || [text isEqualToString:@"
"]) {
self.placeholderLabel.hidden = NO;
} else {
self.placeholderLabel.hidden = YES;
}
}
4.当撤回消息，点击“重新编辑”后，关闭 placeholder 效果的显示
- (void)didTapReedit:(RCMessageModel *)model {self.placeholderLabel.hidden = YES;
[super didTapReedit:model];
}
效果图：