UITextView使用總結

 iOS7中文本對齊方式有以下幾種：

   enum {
        NSTextAlignmentLeft      = 0,  左對齊，默認
        NSTextAlignmentCenter    = 1,  居中對齊
        NSTextAlignmentRight     = 2,  右對齊
        NSTextAlignmentJustified = 3,  在一個段落的最後一行自然對齊
        NSTextAlignmentNatural   = 4,  默認對齊方式
   } NSTextAlignment;

// 設置自動糾錯方式
textView.autocorrectionType = UITextAutocorrectionTypeNo;

 // 自動糾錯方式有以下幾種：
    enum {
        UITextAutocorrectionTypeDefault,  默認
        UITextAutocorrectionTypeNo,       不自動糾錯
        UITextAutocorrectionTypeYes,      自動糾錯
    } UITextAutocorrectionType;

// 設置自動大寫方式
textView.autocapitalizationType = UITextAutocapitalizationTypeNone;

// 自動大寫方式有以下幾種：
    enum {
        UITextAutocapitalizationTypeNone,           不自動大寫
        UITextAutocapitalizationTypeWords,          單詞首字母大寫
        UITextAutocapitalizationTypeSentences,      句子的首字母大寫
        UITextAutocapitalizationTypeAllCharacters,  所有字母都大寫
    } UITextAutocapitalizationType;

// 設置鍵盤的樣式
textView.keyboardType = UIKeyboardTypeDefault;

// 鍵盤樣式有以下幾種：
    enum {
        UIKeyboardTypeDefault,                默認鍵盤，支持所有字符
        UIKeyboardTypeASCIICapable,           支持ASCII的默認鍵盤
        UIKeyboardTypeNumbersAndPunctuation,  標準電話鍵盤，支持＋＊＃字符
        UIKeyboardTypeURL,                    只支持URL字符的URL鍵盤，支持.com按鈕
        UIKeyboardTypeNumberPad,              數字鍵盤
        UIKeyboardTypePhonePad,               電話鍵盤
        UIKeyboardTypeNamePhonePad,           支持輸入人名的電話鍵盤
        UIKeyboardTypeEmailAddress,           電子郵件鍵盤
        UIKeyboardTypeDecimalPad,             有數字和小數點的數字鍵盤
        UIKeyboardTypeTwitter,                優化的鍵盤，方便輸入@、#字符
        UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable,
    } UIKeyboardType;

// 設置return鍵樣式
textView.returnKeyType = UIReturnKeyDefault;
// return鍵有以下幾種樣式：
    enum {
        UIReturnKeyDefault,        默認，灰色按鈕，標有Return
        UIReturnKeyGo,             標有Go的藍色按鈕
        UIReturnKeyGoogle,         標有Google的藍色按鈕，用於搜索
        UIReturnKeyJoin,           標有Join的藍色按鈕
        UIReturnKeyNext,           標有Next的藍色按鈕
        UIReturnKeyRoute,          標有Route的藍色按鈕
        UIReturnKeySearch,         標有Search的藍色按鈕
        UIReturnKeySend,           標有Send的藍色按鈕
        UIReturnKeyYahoo,          標有Yahoo的藍色按鈕
        UIReturnKeyYahoo,          標有Yahoo的藍色按鈕
        UIReturnKeyEmergencyCall,  緊急呼叫按鈕
    } UIReturnKeyType;

// 設置是否可以拖動
textView.scrollEnabled = YES;
// 設置代理
textView.delegate = self;

// 自定義文本框placeholder
tip = [[UILabel alloc] initWithFrame:CGRectMake(16, 14, 320, 25)];
tip.text = @"您的意見是我們前進的最大動力，謝謝！";
tip.font = [UIFont fontWithName:@"Arial" size:16.5f];
tip.backgroundColor = [UIColor clearColor];
tip.enabled = NO;

// 自定義文本框字數統計
count = [[UILabel alloc] initWithFrame:CGRectMake(270, 170, 35, 20)];
count.text = @"240";
count.textAlignment = NSTextAlignmentRight;
count.font = [UIFont fontWithName:@"Arial" size:15.0f];
count.backgroundColor = [UIColor clearColor];
count.enabled = NO;

// 顯示文本框及相關控件
[self.view addSubview:feedback];
[self.view addSubview:tip];
[self.view addSubview:count];

// 限制輸入文本長度
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if (range.location < 240)
    {
        return  YES;
    } else {
        return NO;
    }
}

// 自定義文本框placeholder
- (void)textViewDidChange:(UITextView *)textView
{
    count.text = [NSString stringWithFormat:@"%d", 240 - feedback.text.length];
    if (textView.text.length == 0)
    {
        tip.text = @"";
    } else {
        tip.text = @"";
    }
}

原文地址：http://www.itechzero.com/ios-development-series-four-uitextview-usage-summary.html