iOS中的UITextView

#import "TextViewController.h"

@interface TextViewController ()<UITextViewDelegate>

@end

@implementation TextViewController
/*
UITextView文本视图相比与UITextField直观的区别就是UITextView可以输入多行文字并且可以滚动显示浏览全文。常见UITextView使用在APP的软件简介、内容详情显示、小说阅读显示、发表空间内容输入、说说文本框、评论文本框等。
UITextView的使用有它本身的代理方法，也有继承于父类的方法。本身的方法有从开始编辑到结束编辑的整个过程的监听，继承的方法主要是继承于UIScrollView的方法，因为关于滚动的控制都属于UIScrollView的。
*/

- (void)viewDidLoad {
[super viewDidLoad];

//初始化
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(50, 100, 220, 100)];
textView.tag = 100;

//背景颜色
textView.backgroundColor= [UIColor yellowColor];

//配置文本属性
//1. 设置textView的文本
textView.text = @"Where there is a will, there is a way!";

// 实际上，UITextView的文本默认就是居上显示的，出现上面的情况很多都是因为使用了navigationController让scrollView自动适应屏幕造成的。（UITextView继承自UIScrollView）。
if ([self respondsToSelector:@selector(setAutomaticallyAdjustsScrollViewInsets:)]) {
self.automaticallyAdjustsScrollViewInsets = NO;
}

//2. 设置文字对齐方式 (默认是 NSTextAlignmentLeft)
textView.textAlignment = NSTextAlignmentLeft;

//3. 设置文字的字体和大小 (默认字体是 17 点 Helvetica 普通字体)
textView.font = [UIFont fontWithName:@"Marker Felt" size:20];

//4. 设置字体的颜色
textView.textColor = [UIColor magentaColor];

//5. 是否允许编辑内容 (默认为YES)
textView.editable = YES;

//6. 设置文字能否被选择
textView.selectable = YES;

//7. 返回键的类型 (默认为UIKeyUIReturnKeyDefault)
textView.returnKeyType = UIReturnKeyDefault;

//8. 键盘类型
textView.keyboardType = UIKeyboardTypeDefault;

//9. 是否可以拖动
textView.scrollEnabled = YES;

//10. 设置为边框角弧度
textView.layer.cornerRadius = 5;

//11. 设置边框宽度
textView.layer.borderWidth = 1.0;

//12.UITextView自定选择文字后的菜单
UIMenuItem *menuItem = [[UIMenuItem alloc]initWithTitle:@"分享到空间" action:@selector(changeColor:)];
UIMenuController *menu = [UIMenuController sharedMenuController];
[menu setMenuItems:[NSArray arrayWithObject:menuItem]];
[menuItem release];

//设置代理
textView.delegate = self;

[self.view addSubview:textView];
[textView release];

}
#pragma mark --- wuyiyi
- (void)changeColor:(UIMenuItem *)item {

}

#pragma mark --- UITextViewDelegate
//将要开始编辑时触发
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
NSLog(@"%s, %d", __FUNCTION__, __LINE__);
return YES;
}
//将要结束编辑时触发
- (BOOL)textViewShouldEndEditing:(UITextView *)textView {
NSLog(@"%s, %d", __FUNCTION__, __LINE__);
return YES;
}
//已经开始编辑时触发
- (void)textViewDidBeginEditing:(UITextView *)textView {
NSLog(@"%s, %d", __FUNCTION__, __LINE__);
//回收键盘
//(1)如果程序有导航条, 可以在导航条上添加一个Done按钮, 用来退出键盘
UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(levelEditMode:)];
self.navigationItem.rightBarButtonItem = done;
[done release];
}
//已经结束编辑时触发
- (void)textViewDidEndEditing:(UITextView *)textView {
NSLog(@"%s, %d", __FUNCTION__, __LINE__);
//结束编辑, 消除Done按钮
self.navigationItem.rightBarButtonItem = nil;
}

//改变文本时触发
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
NSLog(@"%s, %d", __FUNCTION__, __LINE__);
//(2)点击return回收键盘
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
}
return YES;
//    return NO;
}

//更改UITextView的光标的位置：
- (void)textViewDidChangeSelection:(UITextView *)textView {
NSRange range;
range.location = 0;
range.length = 0;
textView.selectedRange = range;
}
#pragma mark ---- done action
//点击按钮退出键盘方法
- (void)levelEditMode:(UIBarButtonItem *)sender {
UITextView *textV = (UITextView *)[self.view viewWithTag:100];
[textV resignFirstResponder];
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end