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// _placeholderLabel
UILabel *placeHolderLabel = [[UILabel alloc] init];
placeHolderLabel.text = @"请输入内容";
placeHolderLabel.numberOfLines = 0;
placeHolderLabel.textColor = [UIColor lightGrayColor];
[placeHolderLabel sizeToFit];
[textView addSubview:placeHolderLabel];
// same font
textView.font = [UIFont systemFontOfSize:13.f];
placeHolderLabel.font = [UIFont systemFontOfSize:13.f];
[textView setValue:placeHolderLabel forKey:@"_placeholderLabel"];