记录一个页面的功能：

textview的占位符，字数统计，提交按钮的交互设置，具体效果图如下：

输入效果：

具体实现代码如下：

1，设置代理

@interface FKViewController ()
     

2，我是直接xib拖拽的控件

@property (weak, nonatomic) IBOutlet UITextView *FKTextView;@property (weak, nonatomic) IBOutlet UILabel *descLab;@property (weak, nonatomic) IBOutlet UIButton *sendBtn;@property (weak, nonatomic) IBOutlet UILabel *stringlenghtLab;

3，viewDidLoad里面

self.FKTextView.delegate = self;    self.descLab.userInteractionEnabled = NO;    self.sendBtn.userInteractionEnabled = NO;    self.sendBtn.backgroundColor = [UIColor lightGrayColor];

4，具体代理方法实现

-(void)textViewDidChange:(UITextView *)textView{    self.descLab.hidden = YES;    self.sendBtn.userInteractionEnabled = YES;    self.sendBtn.backgroundColor = MainColor;    //实时显示字数    self.stringlenghtLab.text = [NSString stringWithFormat:@"%ld/100",(long)textView.text.length];        //字数限制    if (textView.text.length >= 100) {        textView.text = [textView.text substringToIndex:100];    }        //取消按钮点击权限，并显示文字    if (textView.text.length == 0) {        self.descLab.hidden = NO;        self.sendBtn.userInteractionEnabled = NO;        self.sendBtn.backgroundColor = [UIColor lightGrayColor];    }}-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{    if ([text isEqualToString:@"\n"]) {                [self.FKTextView resignFirstResponder];                return NO;    }        return YES;}

仅做记录！