键盘退出方式 键盘遮挡

#pragma mark -

#pragma mark 解决虚拟键盘挡住UITextField的方法

- (void)keyboardWillShow:(NSNotification *)noti

{

//键盘输入的界面调整

//键盘的高度

float height = 216.0;

CGRect frame = self.view.frame;

frame.size = CGSizeMake(frame.size.width,
frame.size.height -
height);

[UIView beginAnimations:@"Curl"context:nil];//动画开始

[UIView setAnimationDuration:0.30];

[UIView setAnimationDelegate:self];

[self.view setFrame:frame];

[UIView commitAnimations];

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

// When the user presses return, take focus away from the text field so that the keyboard is dismissed.

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyboard" context:nil];

[UIView setAnimationDuration:animationDuration];

CGRect rect = CGRectMake(0.0f,
20.0f, self.view.frame.size.width, self.view.frame.size.height);

self.view.frame =
rect;

[UIView commitAnimations];

[textField resignFirstResponder];

return YES;

}

- (void)textFieldDidBeginEditing:(UITextField *)textField

{

CGRect frame = textField.frame;

int offset = frame.origin.y +
32 - (self.view.frame.size.height -
216.0);//键盘高度216

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];

[UIView setAnimationDuration:animationDuration];

float width = self.view.frame.size.width;

float height = self.view.frame.size.height;

if(offset > 0)

{

CGRect rect = CGRectMake(0.0f,
-offset,width,height);

self.view.frame =
rect;

}

[UIView commitAnimations];

}

IOS
关闭键盘 退出键盘 的5种方式

http://www.gowhich.com/blog/307

view的父类设置成UIControl
[(UIControl *)self.view addTarget:self action:@selector(backgroundTap:) forControlEvents:UIControlEventTouchDown];

实现这个方法关闭键盘就好了

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：

[csharp] view
plaincopy

#import <UIKit/UIKit.h>

@[b]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：

[csharp] view
plaincopy

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：

[csharp] view
plaincopy

- (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：

[csharp] view
plaincopy

#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：

[csharp] view
plaincopy

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：

[csharp] view
plaincopy

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：

[csharp] view
plaincopy

[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

[/b]

在ViewDidLoad中加入：

[csharp] view
plaincopy

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：

[csharp] view
plaincopy

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

{

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

{

if(textView.selectedRange.length>0)

return YES;

}

return NO;

}