《iOS 8开发指南》，自己总结用
UITextView
文本视图（UITextView）与文本框类似，差别在于文本视图可显示一个可滚动和编辑的文本块，供用户阅读或修改。仅当需要的的输入很多时，才应使用文本视图。
Attribute Inspector分为3部分(TextField, control, view)
(1) Text:设置文本框的默认文本
(2) Placeholder:可以在文本框中显示灰色的字，用于提示用户应该在这个文本框输入什么内容。输入文字，自动消失。
(3) Background：设置背景
(4) Disabled：若选中此项，用户将不能更改文本框内容
(5) 接下来是3个按钮，用来设置对齐方式
(6) Border Style：选择边界风格
(7) 清楚按钮
——》Never appears:从不出现
——》Appears while editing：编辑时出现
——》Appears unless editing: 编辑时不出现
——》Is always visible:总是可见
(8) Clear when editing begins:若选中此项，则当开始编辑这个文本框时，文本框中之前的内容会被清除掉。
(9)设置文本框中文本的颜色
(10)Font：设置文本的字体与字号
(11)Min Font Size :最小字体
(12)Adjust To Fit:指定文本框尺寸缩小时文本框中的文本是否也要缩小。选择它，可以使得全本文本都可见，及时文本可长。但是这个选项要跟Min Font Size配合使用，文本再缩小，也不会小于设定的Min Font Size.
(13)Capitalization:设置大写。下啦菜单中有4个选项。
——》None：不设置大写
——》Words：每个单词首字母大写，这里的单词指的是以空格分开的字符串
——》Sentences：每个句子的第一个字母大写，这里的句子是以句号加空格分开的字符串
——》 All Characters:所有字母大写
(14) Correction:检查拼写，默认是YES
(15)Keyboard：选择键盘类型，比如全数字、字母和数字等
(16)Return Key:选择返回键，可以选择Search、Return、Done等
(17)Auto-enable Return Key:如选择此项，则只有至少在文本框输入一个字符后键盘的返回键才有效。
(18)Secure:当你的文本框用作密码输入框时，可以选择此项。
常用属性
(1) textColor
(2) font
(3) editable
(4) textAlignment
——》UITextAlignmentRight:右对齐
——》UITextAlignmentCenter:居中对齐
——》UITextAlignmentLeft:左对齐
在屏幕中换行显示文本
//TextView
-(void)testUITextView1{
UITextView *textView = [[UITextView alloc]init];
textView.frame = self.view.bounds;
textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
// textView.editable = NO;//不可编辑
textView.backgroundColor = [UIColor blackColor];//背景为黑色
textView.textColor = [UIColor whiteColor];//字符为白色
textView.font = [UIFont systemFontOfSize:32];//字体的设置
//textView.textAlignment = NSTextAlignmentCenter;
textView.text = @"学习UITextView\n"
"第2行\n"
"第3行\n"
"第3行\n"
"第4行\n"
"第5行\n"
"第6行\n"
"第7行\n"
"第8行\n"
"第9行\n"
"第10行\n"
"第11行\n"
"第12行\n";
[self.view addSubview:textView];
}在屏幕中显示可编辑的文本
-(void)testUITextView2{
self.uiTextView2 = [[UITextView alloc]init];
self.uiTextView2.frame = self.view.bounds;
self.uiTextView2.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.uiTextView2.delegate = self;
self.uiTextView2.text = @"亲们，可以编辑这一段文本";
[self.view addSubview:self.uiTextView2];
}
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO animated:YES];
[self.navigationController setToolbarHidden:NO animated:YES];
}
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[self textViewDidEndEditing:self.uiTextView2]; //画面显示时， 设置为非编辑模式
}
- (void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[self.uiTextView2 resignFirstResponder];//画面跳转时设置为非编辑模式
}
- (void)textViewDidBeginEditing:(UITextView *)textView{
static const CGFloat kKeyboardHeight = 216.0;
//按钮设置为【完成】
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneDidPush)];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
//缩小UITextView以免被键盘挡住
CGRect textViewFrame = textView.frame;
textViewFrame.size.height = self.view.bounds.size.height - kKeyboardHeight;
textView.frame = textViewFrame;
//工具条位置上移
CGRect toolbarFrame = self.navigationController.toolbar.frame;
toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height - kKeyboardHeight;
self.navigationController.toolbar.frame = toolbarFrame;
[UIView commitAnimations];
}
- (void)textViewDidEndEditing:(UITextView *)textView{
// 按钮设置为【编辑】
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(editDidPush)];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
// 恢复UITextView的尺寸
textView.frame = self.view.bounds;
//恢复工具条的位置
CGRect toolbarFrame = self.navigationController.toolbar.frame;
toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height;
self.navigationController.toolbar.frame = toolbarFrame;
[UIView commitAnimations];
}
-(void)editDidPush{
[self.uiTextView2 becomeFirstResponder];
}
-(void)doneDidPush{
[self.uiTextView2 resignFirstResponder];
}-(void)testUITextView3{
//UITextView的追加
self.uiTextView3 = [[UITextView alloc]init];
self.uiTextView3.frame = self.view.bounds;
self.uiTextView3.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.uiTextView3.text = @"此文本可编辑";
// [self.view addSubview:self.uiTextView3];
//在工具条中追加
UIBarButtonItem *hasTextButton = [[UIBarButtonItem alloc] initWithTitle:@"hasText" style:UIBarButtonItemStylePlain target:self action:@selector(hasTextDidPush)];
UIBarButtonItem *selectionButton = [[UIBarButtonItem alloc]initWithTitle:@"selction" style:UIBarButtonItemStylePlain target:self action:@selector(selectionDidPush)];
UIBarButtonItem *alignmentButton = [[UIBarButtonItem alloc]initWithTitle:@"alignment" style:UIBarButtonItemStylePlain target:self action:@selector(alignmentDidPush)];
UIBarButtonItem *scrollButton = [[UIBarButtonItem alloc]initWithTitle:@"" style:UIBarButtonItemStylePlain target:self action:@selector(scrollDidPush)];
NSArray *buttons = [NSArray arrayWithObjects:hasTextButton, selectionButton, alignmentButton, scrollButton,nil];
[self setToolbarItems:buttons animated:YES];
}
- (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
static const CGFloat kKeyboardHeight = 216.0;
//调整工具条位置
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
self.uiTextView3.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - kKeyboardHeight);
CGRect toolbarFrame = self.navigationController.toolbar.frame;
toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height - kKeyboardHeight;
self.navigationController.toolbar.frame = toolbarFrame;
[UIView commitAnimations];
[self.uiTextView3 becomeFirstResponder]; // 画面显示时显示键盘
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
// 恢复工具条
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3];
self.uiTextView3.frame = self.view.bounds;
CGRect toolbarFrame = self.navigationController.toolbar.frame;
toolbarFrame.origin.y = self.view.window.bounds.size.height - toolbarFrame.size.height;
self.navigationController.toolbar.frame = toolbarFrame;
[UIView commitAnimations];
[self.uiTextView3 resignFirstResponder];
}
-(void)hasTextDidPush{
UIAlertView *alert = [[UIAlertView alloc]init];
if(self.uiTextView3.hasText) {
alert.message = @"textView.hasText = YES";
} else {
alert.message = @"textView.hasText = NO";
}
[alert addButtonWithTitle:@"OK"];
[alert show];
}
-(void)selectionDidPush{
UIAlertView *alert = [[UIAlertView alloc]init];
alert.message = [NSString stringWithFormat:@"location = %lu, length = %d", (unsigned long)self.uiTextView3.selectedRange.location, self.uiTextView3.selectedRange.length];
[alert addButtonWithTitle:@"OK"];
[alert show];
}
-(void)alignmentDidPush{
self.uiTextView3.editable = NO;
if(UITextAlignmentRight < ++self.uiTextView3.textAlignment) {
self.uiTextView3.textAlignment = UITextAlignmentLeft;
}
self.uiTextView3.editable = YES;
}
-(void)scrollDidPush{
//NSRange scrollRange = NSMakeRange(0, 1);
[self.uiTextView3 scrollRangeToVisible:NSMakeRange(0, 1)];
}