UItextView的用法及技巧（iOS7下光标bug解決方案）

目錄[-]

• 一、建立一個textView
• 二、鍵盤操作
• 三、隐藏鍵盤的幾種方式
• 四、使鍵盤不擋住輸入框
• 效果圖：
• iOS7光标問題

一、建立一個textView

01

//初始化

02	UITextView *textView = [[[UITextView alloc] init] autorelease];

03

04	//設定代理 需在interface中聲明UITextViewDelegate

05	textView.delegate = self;

06

07

//字型大小

08	textView.font = [UIFont systemFontOfSize:16];

09

10

//添加滾動區域

11	textView.contentInset = UIEdgeInsetsMake(-11, -6, 0, 0);

12

13

//是否可以滾動

14	textView.scrollEnabled = NO;

15

16

//獲得焦點

17	[textView becomeFirstResponder];

1	[self.view addSubview:textView];

二、鍵盤操作

1

//傳回鍵的類型

2	textView.returnKeyType = UIReturnKeyDefault;

3

4

//鍵盤類型

5	textView.keyboardType = UIKeyboardTypeDefault;

三、隐藏鍵盤的幾種方式

個人還是認為最友善的是在鍵盤上加上一個ToolBar，在上面加上一個按鈕來隐藏鍵盤

①在鍵盤上加上隐藏按鈕

01	//定義一個toolBar

02	UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];

03

04

//設定style

05	[topView setBarStyle:UIBarStyleBlack];

06

07	//定義兩個flexibleSpace的button，放在toolBar上，這樣完成按鈕就會在最右邊

08	UIBarButtonItem * button1 =[[UIBarButtonItem  alloc]initWithBarButtonSystemItem:                                        UIBarButtonSystemItemFlexibleSpace target:self action:nil];

09

10	UIBarButtonItem * button2 = [[UIBarButtonItem  alloc]initWithBarButtonSystemItem:                                        UIBarButtonSystemItemFlexibleSpace target:self action:nil];

11

12

//定義完成按鈕

13	UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@ "完成" style:UIBarButtonItemStyleDone  target:self action:@selector(resignKeyboard)];

14

15	//在toolBar上加上這些按鈕

16	NSArray * buttonsArray = [NSArray arrayWithObjects:button1,button2,doneButton,nil];

17	[topView setItems:buttonsArray];

18

19	[textView setInputAccessoryView:topView];

1

//隐藏鍵盤

2	- ( void )resignKeyboard {

3	[textView resignFirstResponder];

4

}

最終效果

還有幾種也可隐藏鍵盤的方式

②用Enter鍵，前提是你的textView中不需要用到Enter鍵

1	-( BOOL )textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

2	if ([text isEqualToString:@ "\n" ])

3

{

4	[textView resignFirstResponder];  return NO;

5

}

6	return YES;

7

}

③觸摸空白處隐藏鍵盤

1	-( void )touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

2

{

3

//隐藏鍵盤

4	[textView resignFirstResponder];

5

}

四、使鍵盤不擋住輸入框

    在view中添加一個子view，設定此子view的tag值為1000，在此view上添加一個textView和一個發送按鈕，如下圖；我們要達到textView的鍵盤彈出時，整個View往上平移，鍵盤消失，view往下平移的效果，模拟發送短信的界面。

設定textView圓角

1	//設定textView圓角

2	[self.textView.layer setCornerRadius:10];

①、在viewWillAppear中添加鍵盤監聽事件

1	//添加鍵盤的監聽事件

2

3	//注冊通知,監聽鍵盤彈出事件

4	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];

5

6	//注冊通知,監聽鍵盤消失事件

7	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHidden) name:UIKeyboardDidHideNotification object:nil];

②、完成①selector中鍵盤彈出keyboardDidShow:和消失keyboardDidHidden方法

    在.m檔案#import後面添加

1

//動畫時間

2	#define kAnimationDuration 0.2

3

//view高度

4	#define kViewHeight 56

鍵盤出現

01

// 鍵盤彈出時

02	-( void )keyboardDidShow:(NSNotification *)notification

03

{

04

05

//擷取鍵盤高度

06	NSValue *keyboardObject = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];

07

08	CGRect keyboardRect;

09

10	[keyboardObject getValue:&keyboardRect];

11

12	//調整放置有textView的view的位置

13

14

//設定動畫

15	[UIView beginAnimations:nil context:nil];

16

17

//定義動畫時間

18	[UIView setAnimationDuration:kAnimationDuration];

19

20	//設定view的frame，往上平移

21	[(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-keyboardRect.size.height-kViewHeight, 320, kViewHeight)];

22

23	[UIView commitAnimations];

24

25

}

鍵盤消失

01

//鍵盤消失時

02	-( void )keyboardDidHidden

03

{

04

//定義動畫

05	[UIView beginAnimations:nil context:nil];

06	[UIView setAnimationDuration:kAnimationDuration];

07	//設定view的frame，往下平移

08	[(UIView *)[self.view viewWithTag:1000] setFrame:CGRectMake(0, self.view.frame.size.height-kViewHeight, 320, kViewHeight)];

09	[UIView commitAnimations];

10

}

效果圖：

iOS7光标問題

PS：有網友遇到textView在ios7上出現編輯進入最後一行時光标消失，看不到最後一行，變成盲打，stackOverFlow網站上有大神指出，是ios7本身bug，加上下面一段代碼即可（網友調試得出，在此mark一下，有問題，歡迎大神們指出）

view source print ?

01	-( void )textViewDidChange:(UITextView *)textView {

02	CGRect line = [textView caretRectForPosition:

03	textView.selectedTextRange.start];

04	CGFloat overflow = line.origin.y + line.size.height

05	- ( textView.contentOffset.y + textView.bounds.size.height

06	- textView.contentInset.bottom - textView.contentInset.top );

07	if ( overflow > 0 ) {

08	// We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it)

09	// Scroll caret to visible area

10	CGPoint offset = textView.contentOffset;

11	offset.y += overflow + 7;  // leave 7 pixels margin

12	// Cannot animate with setContentOffset:animated: or caret will not appear

13	[UIView animateWithDuration:.2 animations:^{

14	[textView setContentOffset:offset];

15

}];

16

}

17

}