IOS6 控件专辑

IOS 控件专辑
UITextView控件

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：
//==============================================================================

#import <UIKit/UIKit.h>

@inte易做图ce TextViewController : UIViewController <UITextViewDelegate>

@property (nonatomic, weak) UITextView *textView;

@end

//==============================================================================

在.m文件中初始化这个textview，写入代码如下：
//初始化大小并自动释放
self.textView = [[UITextView alloc] initWithFrame:self.view.frame];
//设置textview里面的字体颜色
self.textView.textColor = [UIColor blackColor];
//设置字体名字和字体大小
self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];
//设置它的委托方法
self.textView.delegate =self;
//设置它的背景颜色
self.textView.backgroundColor = [UIColor whiteColor];
//设置它显示的内容
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.";
//返回键的类型
self.textView.returnKeyType = UIReturnKeyDefault;
//键盘类型
self.textView.keyboardType = UIKeyboardTypeDefault;
//是否可以拖动
self.textView.scrollEnabled =YES;
//自适应高度
self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;
//加入到整个页面中
[self.view addSubview:self.textView];

2.设置UITextView圆角问题

引用#import QuartzCore/QuartzCore.h后，
调用[textView.layer setCornerRadius:10];设定UITextView圓角

3. 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:14.0f]
constrainedToSize:CGSizeMake(FLT_MAX,21.0)
lineBreakMode:NSLineBreakByWordWrapping];

4. 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)];

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 www.zzzyk.com
target:self action:@selector(dismissKeyBoard)];

NSArray * buttonsArray =@[helloButton, btnSpace, doneButton];

[topView setItems:buttonsArray];

[tvTextView setInputAccessoryView:topView];
}

-(void)dismissKeyBoard
{
[tvTextView resignFirstResponder];
}

补充：移动开发 , IOS ,