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:
复制代码 代码如下:
#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:
复制代码 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:
复制代码 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:
复制代码 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:
复制代码 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:
复制代码 代码如下:
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:
复制代码 代码如下:
[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:
复制代码 代码如下:
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:
复制代码 代码如下:
-(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:
3.一些个性化定制
总体来说个性化定制UITextView中的内容有两种方法:
(1)从文件中读取内容到UITextView,这个个人感觉使用rtfd和rtf格式文件效果非常好。
(2)使用NSAttributeString进行定制
具体方法如下:
复制代码 代码如下:
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
paragraphStyle.lineHeightMultiple = 20.f;
paragraphStyle.maximumLineHeight = 25.f;
paragraphStyle.minimumLineHeight = 15.f;
paragraphStyle.firstLineHeadIndent = 20.f;
paragraphStyle.alignment = NSTextAlignmentJustified;
NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:14], NSParagraphStyleAttributeName:paragraphStyle, NSForegroundColorAttributeName:[UIColor colorWithRed:76./255. green:75./255. blue:71./255. alpha:1]
};
textView.attributedText = [[NSAttributedString alloc]initWithString:content attributes:attributes];
当然也可以初始化一个NSMutableAttributedString,然后向里面添加文字样式,最后将它赋给textView的AttributedText即可
复制代码 代码如下:
NSMutableAttributedString *atr = [[NSMutableAttributedString alloc]initWithString:detail];
[atr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, detail.length)];
textView.attributedText = atr;
另外,对于textview中的链接样式,同样也可以定制
复制代码 代码如下:
NSDictionary *linkAttributes = @{NSForegroundColorAttributeName: [UIColor blueColor],
NSUnderlineColorAttributeName: [UIColor blackColor],
NSUnderlineStyleAttributeName: @(NSUnderlinePatternDash)};
self.linkTextAttributes = linkAttributes;
这里只是个简单的例子,具体还有很多属性可以自行参考头文件
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