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  • UItextView使用详解

    1.创建并初始化

    创建UITextView的文件,并在.h文件中写入如下代码:

    #import <UIKit/UIKit.h> 

    @interface TextViewController : UIViewController <UITextViewDelegate> 

                  UITextView *textView; 

    @property (nonatomic, retain) UITextView *textView; 

    @end 

    在.m文件中初始化这个textview,写入代码如下:

    self.textView = [[[UITextView alloc] initWithFrame:self.view.frame]autorelease]; //初始化大小并自动释放 

    self.textView.textColor = [UIColor blackColor];//设置textview里面的字体颜色 

    self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];//设置字体名字和字体大小 

    self.textView.delegate = self;//设置它的委托方法 

    self.textView.backgroundColor = [UIColor whiteColor];//设置它的背景颜色 

                  

    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.";//设置它显示的内容 

    self.textView.returnKeyType = UIReturnKeyDefault;//返回键的类型 

    self.textView.keyboardType = UIKeyboardTypeDefault;//键盘类型 

    self.textView.scrollEnabled = YES;//是否可以拖动 

                  

    self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度 

                  

    [self.view addSubview: self.textView];//加入到整个页面中 

    2. UITextView退出键盘的几种方式

    因为你点击UITextView会出现键盘,如果你退出键盘,有如下几种方式:

    (1)如果你程序是有导航条的,可以在导航条上面加多一个Done的按钮,用来退出键盘,当然要先实UITextViewDelegate。

    代码如下:

    - (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里不用回车键,可以把回车键当做退出键盘的响应键。

    代码如下:

    #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;   

    }   

    这样无论你是使用电脑键盘上的回车键还是使用弹出键盘里的return键都可以达到退出键盘的效果。

    (3)还有你也可以自定义其他加载键盘上面用来退出,比如在弹出的键盘上面加一个view来放置退出键盘的Done按钮。

    代码如下:

    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]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)设置UITextView圆角问题

    做法是在#import QuartzCore/QuartzCore.h 后,便能調用[textView.layer setCornerRadius:10]; 來把UITextView 设定圓角

    (5)UITextView根据文本大小自适应高度

    通过实现文本字数来确定高度,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需要定义的numberoflines为0,即不做行数的限制。如下:

    [label  setNumberOfLines:0];   

    [label  setFrame:CGRectMake(40, 135, 240, size.height+10)];   

    [label setText:desc];  

    (6)UITextView自定选择文字后的菜单

    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]; 

    当然上面那个@selector里面的changeColor方法还是自己写吧,也就是说点击了我们自定义的菜单项后会触发的方法。

    然后还得在代码里加上一个方法:

    -(BOOL)canPerformAction:(SEL)action withSender:(id)sender 

    if(action ==@selector(changeColor:)) 

    if(textView.selectedRange.length>0) 

    return YES; 

    return NO; 

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  • 原文地址:https://www.cnblogs.com/ligun123/p/2255862.html
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