UITextView 用法小结

// 初始化输入框并设置位置和大小UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(10, 10, 300, 180)];// 设置预设文本textView.text = @"";// 设置文本字体textView.font = [UIFont fontWithName:@"Arial" size:16.5f];// 设置文本颜色textView.textColor = [UIColor colorWithRed:51/255.0f green:51/255.0f blue:51/255.0f alpha:1.0f];// 设置文本框背景颜色textView.backgroundColor = [UIColor colorWithRed:254/255.0f green:254/255.0f blue:254/255.0f alpha:1.0f];// 设置文本对齐方式textView.textAlignment = NSTextAlignmentLeft;// iOS7中文本对齐方式有以下几种：//    enum {//        NSTextAlignmentLeft      = 0,  左对齐，默认//        NSTextAlignmentCenter    = 1,  居中对齐//        NSTextAlignmentRight     = 2,  右对齐//        NSTextAlignmentJustified = 3,  在一个段落的最后一行自然对齐//        NSTextAlignmentNatural   = 4,  默认对齐方式//    } NSTextAlignment;// 设置自动纠错方式textView.autocorrectionType = UITextAutocorrectionTypeNo;// 自动纠错方式有以下几种：//    enum {//        UITextAutocorrectionTypeDefault,  默认//        UITextAutocorrectionTypeNo,       不自动纠错//        UITextAutocorrectionTypeYes,      自动纠错//    } UITextAutocorrectionType;// 设置自动大写方式textView.autocapitalizationType = UITextAutocapitalizationTypeNone;// 自动大写方式有以下几种：//    enum {//        UITextAutocapitalizationTypeNone,           不自动大写//        UITextAutocapitalizationTypeWords,          单词首字母大写//        UITextAutocapitalizationTypeSentences,      句子的首字母大写//        UITextAutocapitalizationTypeAllCharacters,  所有字母都大写//    } UITextAutocapitalizationType;// 设置键盘的样式textView.keyboardType = UIKeyboardTypeDefault;// 键盘样式有以下几种：//    enum {//        UIKeyboardTypeDefault,                默认键盘，支持所有字符//        UIKeyboardTypeASCIICapable,           支持ASCII的默认键盘//        UIKeyboardTypeNumbersAndPunctuation,  标准电话键盘，支持＋＊＃字符//        UIKeyboardTypeURL,                    只支持URL字符的URL键盘，支持.com按钮//        UIKeyboardTypeNumberPad,              数字键盘//        UIKeyboardTypePhonePad,               电话键盘//        UIKeyboardTypeNamePhonePad,           支持输入人名的电话键盘//        UIKeyboardTypeEmailAddress,           电子邮件键盘//        UIKeyboardTypeDecimalPad,             有数字和小数点的数字键盘//        UIKeyboardTypeTwitter,                优化的键盘，方便输入@、#字符//        UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable,//    } UIKeyboardType;// 设置return键样式textView.returnKeyType = UIReturnKeyDefault;// return键有以下几种样式：//    enum {//        UIReturnKeyDefault,        默认，灰色按钮，标有Return//        UIReturnKeyGo,             标有Go的蓝色按钮//        UIReturnKeyGoogle,         标有Google的蓝色按钮，用于搜索//        UIReturnKeyJoin,           标有Join的蓝色按钮//        UIReturnKeyNext,           标有Next的蓝色按钮//        UIReturnKeyRoute,          标有Route的蓝色按钮//        UIReturnKeySearch,         标有Search的蓝色按钮//        UIReturnKeySend,           标有Send的蓝色按钮//        UIReturnKeyYahoo,          标有Yahoo的蓝色按钮//        UIReturnKeyYahoo,          标有Yahoo的蓝色按钮//        UIReturnKeyEmergencyCall,  紧急呼叫按钮//    } UIReturnKeyType;// 设置是否可以拖动textView.scrollEnabled = YES;// 设置代理textView.delegate = self;// 自定义文本框placeholdertip = [[UILabel alloc] initWithFrame:CGRectMake(16, 14, 320, 25)];tip.text = @"您的意见是我们前进的最大动力，谢谢！";tip.font = [UIFont fontWithName:@"Arial" size:16.5f];tip.backgroundColor = [UIColor clearColor];tip.enabled = NO;// 自定义文本框字数统计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;// 显示文本框及相关控件[self.view addSubview:feedback];[self.view addSubview:tip];[self.view addSubview:count];// 限制输入文本长度- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{    if (range.location < 240)    {        return  YES;    } else {        return NO;    }}// 自定义文本框placeholder- (void)textViewDidChange:(UITextView *)textView{    count.text = [NSString stringWithFormat:@"%d", 240 - feedback.text.length];    if (textView.text.length == 0)    {        tip.text = @"您的意见是我们前进的最大动力，谢谢！";    } else {        tip.text = @"";    }}