UITextView详解

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 to come to serve their country.\n\nNow is the time for all good developers to come to 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];

然后需要定义UITextView的numberoflines为0,即不做行数的限制。如下:

 
[textView setNumberOfLines:0];  
[textView setFrame:CGRectMake(40, 135, 240, size.height+10)];  
[textView 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;
}

实现后如下图:

UITextView详解

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