1.創建並初始化
UITextView
UITextView *textView;self.textView = [[[UITextView alloc] initWithFrame:self.view.frame]autorelease]; //初始化大小並自動釋放 self.textView.textColor = [UIColor blackColor];//設置textview裏面的字體顏色
self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];//設置字體名字和字體大小 self.textView.delegate = self;//設置它的委託方法
self.textView.backgroundColor = [UIColor whiteColor];//設置它的背景顏色
self.textView.text = @"Now is the time for all good developers tocome to serve their country.\n\nNow is the time for all good developers to cometo serve their country.";//設置它顯示的內容 self.textView.returnKeyType = UIReturnKeyDefault;//返回鍵的類型
self.textView.keyboardType = UIKeyboardTypeDefault;//鍵盤類型
self.textView.scrollEnabled = YES;//是否可以拖動
self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自適應高度
[self.view addSubview: self.textView];//加入到整個頁面中2.
UITextView退出鍵盤的幾種方式
（1）如果你程序是有導航條的，可以在導航條上面加多一個Done的按鈕，用來退出鍵盤，當然要先實UITextViewDelegate。
- (void)textViewDidBeginEditing:(UITextView *)textView {
UIBarButtonItem *done = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease];
self.navigationItem.rightBarButtonItem = done;
}
- (void)textViewDidEndEditing:(UITextView *)textView {
self.navigationItem.rightBarButtonItem = nil;
}
- (void)leaveEditMode {
[self.textView resignFirstResponder];
}
（2）如果你的textview裏不用回車鍵，可以把回車鍵當做退出鍵盤的響應鍵。
#pragma mark - UITextView Delegate Methods
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
if ([text isEqualToString:@"\n"])
{
[textView resignFirstResponder]; return NO;
}
return YES;
}這樣無論你是使用電腦鍵盤上的回車鍵還是使用彈出鍵盤裏的return鍵都可以達到退出鍵盤的效果。
（3）還有你也可以自定義其他加載鍵盤上面用來退出，比如在彈出的鍵盤上面加一個view來放置退出鍵盤的Done按鈕。
UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];
[topView setBarStyle:UIBarStyleBlack];
UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];
UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]init] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target:self action:nil];
UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];
NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil]; [doneButton release];
[btnSpace release];
[helloButton release];
[topView setItems:buttonsArray];
[tvTextView setInputAccessoryView:topView];
-(IBAction)dismissKeyBoard {
[tvTextView resignFirstResponder];
}（4）設置UITextView圓角問題
做法是在 #import QuartzCore/QuartzCore.h 後，便能調用[textView.layer setCornerRadius:10];
（5）UITextView根據文本大小自適應高度
通過實現文本字數來確定高度，如下：
NSString * desc = @"Description it is a test font, and don't become angry for which i use to do here.Now here is a very nice party from american or not!";
CGSize size = [desc sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(240, 2000) lineBreakMode:UILineBreakModeWordWrap];只有UILabel需要定義的numberoflines爲0，即不做行數的限制。如下：[label setNumberOfLines:0];
[label setFrame:CGRectMake(40, 135, 240, size.height+10)];
[label setText:desc];（6）UITextView自定選擇文字後的菜單
在ViewDidLoad中加入：
UIMenuItem *menuItem = [[UIMenuItem alloc]initWithTitle:@"分享到新浪微博" action:@selector(changeColor:)];
UIMenuController *menu = [UIMenuController sharedMenuController];
[menu setMenuItems:[NSArray arrayWithObject:menuItem]];
[menuItem release];當然上面那個@selector裏面的changeColor方法還是自己寫吧，也就是說點擊了我們自定義的菜單項後會觸發的方法。
然後還得在代碼里加上一個方法：
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender {
if(action ==@selector(changeColor:)) {
if(textView.selectedRange.length>0) return YES;
} return NO;
}
點擊非輸入框時隱藏鍵盤
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[usertf resignFirstResponder];
[paswldtf resignFirstResponder];
}
摘自http://blog.csdn.net/qiaoshe/article/details/6955091