//视图已经加载完了,可以进行ui的添加了
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view.
//初始化UILabel注意指定该对象的位置及大小
UILabel *lb = [[UILabelalloc]initWithFrame:CGRectMake(0,20,300,200)];
//设置文字
lb.text =@"label测试我在学习中学些ui story水电费水电费未入围 i肉煨入味哦水电费水电费水电费";
//设置背景色
lb.backgroundColor = [UIColorcolorWithRed:0green:191.0/255.0blue:243.0/255.0alpha:1.0];
//设置文字颜色
lb.textColor = [UIColorwhiteColor];
//文字大小,文字字体
lb.font = [UIFontsystemFontOfSize:25];
NSLog(@"系统字体名字:%@",lb.font.familyName);
//打印文字字体列表
NSArray *arrFonts = [UIFontfamilyNames];
NSLog(@"系统字体列表:%@",arrFonts);
//文字对齐
lb.textAlignment =NSTextAlignmentJustified;
// NSTextAlignmentLeft = 0, //居左对齐,默认
// NSTextAlignmentCenter = 1, //居中对齐
// NSTextAlignmentRight = 2, //居右对齐
// NSTextAlignmentJustified = 3, // Fully-justified. The last line in a paragraph is natural-aligned.
// NSTextAlignmentNatural = 4, // Indicates the default alignment for script
//换行模式
lb.lineBreakMode =NSLineBreakByCharWrapping;
// NSLineBreakByWordWrapping = 0, //每一行的结尾以字或者一个完整单词换行(若不够一个单词的位置)
// NSLineBreakByCharWrapping,//在每一行的结尾以字母进行换行
// NSLineBreakByClipping,// Simply clip
// NSLineBreakByTruncatingHead,// Truncate at head of line: "...wxyz"
// NSLineBreakByTruncatingTail,// Truncate at tail of line: "abcd..."
// NSLineBreakByTruncatingMiddle// Truncate middle of line: "ab...yz"
//指定行数,0为不限制行树,可以指定具体的数字
lb.numberOfLines =0;
//加圆角
lb.layer.cornerRadius =30;
//此行必须加,将原来的矩形角剪掉
lb.clipsToBounds =YES;
//加边框颜色,宽度,注意给layer加的颜色是CGColor类型
lb.layer.borderColor = [[UIColorredColor]CGColor];
lb.layer.borderWidth =1.0;
//把label添加到视图上,并且会显示
[self.viewaddSubview:lb];
}
Label的首行缩进一直是个很头疼的问题,现在IOS6只有有一个 attributedText的属性值得我们深究,可以达到我们自定义的行高,还有首行缩进,各种行距和间隔问题。下面这个是两个Label, 一个是UserName,另一个是Content文本多行信息
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@interface ViewController : UIViewController
@property ( weak , nonatomic ) IBOutlet UILabel *usernameLabel
@property ( weak , nonatomic ) IBOutlet UILabel *contentLabel;
@end
视图展示层
- ( void )viewDidLoad {
self . usernameLabel . text = @"用户名Jordan CZ: " ;
self . usernameLabel . adjustsFontSizeToFitWidth = YES ;
[ self . usernameLabel sizeToFit ];
self . contentLabel . text = @"首行缩进根据用户昵称自动调整 间隔可自定根据需求随意改变。。。。。。。" ;
self . contentLabel . adjustsFontSizeToFitWidth = YES ;
self . contentLabel . adjustsLetterSpacingToFitWidth = YES ;
[ self resetContent ];
}
自适应计算间距
- ( void )resetContent{
NSMutableAttributedString *attributedString = [[ NSMutableAttributedString alloc ]initWithString : self . contentLabel . text ];
NSMutableParagraphStyle *paragraphStyle = [[ NSMutableParagraphStyle alloc ]init ];
paragraphStyle. alignment = NSTextAlignmentLeft ;
paragraphStyle. maximumLineHeight = 60 ; //最大的行高
paragraphStyle. lineSpacing = 5 ; //行自定义行高度
[paragraphStyle setFirstLineHeadIndent : self . usernameLabel . frame . size .width + 5 ]; //首行缩进 根据用户昵称宽度在加5个像素
[attributedString addAttribute : NSParagraphStyleAttributeName value:paragraphStyle range : NSMakeRange ( 0 , [ self . contentLabel . text length ])];
self . contentLabel . attributedText = attributedString;
[ self . contentLabel sizeToFit ];
}
UITextView的使用详解
//初始化并定义大小
UITextView *textview = [[UITextView alloc] initWithFrame:CGRectMake(20, 10, 280, 30)];
textview.backgroundColor=[UIColor whiteColor]; //背景色
textview.scrollEnabled = NO; //当文字超过视图的边框时是否允许滑动,默认为“YES”
textview.editable = YES; //是否允许编辑内容,默认为“YES”
textview.delegate = self; //设置代理方法的实现类
textview.font=[UIFont fontWithName:@"Arial" size:18.0]; //设置字体名字和字体大小;
textview.returnKeyType = UIReturnKeyDefault;//return键的类型
textview.keyboardType = UIKeyboardTypeDefault;//键盘类型
textview.textAlignment = NSTextAlignmentLeft; //文本显示的位置默认为居左
textview.dataDetectorTypes = UIDataDetectorTypeAll; //显示数据类型的连接模式(如电话号码、网址、地址等)
textview.textColor = [UIColor blackColor];
textview.text = @"UITextView详解";//设置显示的文本内容
[self.view addSubview:textview];
UITextView的代理方法如下:
//将要开始编辑
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;
//将要结束编辑
- (BOOL)textViewShouldEndEditing:(UITextView *)textView;
//开始编辑
- (void)textViewDidBeginEditing:(UITextView *)textView;
//结束编辑
- (void)textViewDidEndEditing:(UITextView *)textView;
//内容将要发生改变编辑
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text;
//内容发生改变编辑
- (void)textViewDidChange:(UITextView *)textView;
//焦点发生改变
- (void)textViewDidChangeSelection:(UITextView *)textView;
有时候我们要控件自适应输入的文本的内容的高度,只要在textViewDidChange的代理方法中加入调整控件大小的代理即可
- (void)textViewDidChange:(UITextView *)textView{
//计算文本的高度
CGSize constraintSize;
constraintSize.width = textView.frame.size.width-16;
constraintSize.height = MAXFLOAT;
CGSize sizeFrame =[textView.text sizeWithFont:textView.font
constrainedToSize:constraintSize
lineBreakMode:UILineBreakModeWordWrap];
//重新调整textView的高度
textView.frame =CGRectMake(textView.frame.origin.x,textView.frame.origin.y,textView.frame.size.width,sizeFrame.height+5);
}
控制输入文字的长度和内容,可通调用以下代理方法实现
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text
{
if (range.location>=100)
{
//控制输入文本的长度
return NO;
}
if ([text isEqualToString:@"\n"]) {
//禁止输入换行
return NO;
}
else
{
return YES;
}
}
UITextView退出键盘的几种方式
因为iphone的软键盘没有自带的退键盘键,所以要实现退出键盘需要自己实现,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。
- (void)textViewDidBeginEditing:(UITextView *)textView {
UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
target:self
action:@selector(dismissKeyBoard)];
self.navigationItem.rightBarButtonItem = done;
[done release];
done = nil;
}
- (void)textViewDidEndEditing:(UITextView *)textView {
self.navigationItem.rightBarButtonItem = nil;
}
- (void)dismissKeyBoard {
[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:
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text
{
if ([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
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 *btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:self
action:nil];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done"
style:UIBarButtonItemStyleDone
target:self
action:@selector(dismissKeyBoard)];
NSArray * buttonsArray = @[btnSpace, doneButton];;
[doneButton release];
[btnSpace release];
[topView setItems:buttonsArray];
[textView setInputAccessoryView:topView];//当文本输入框加上topView
[topView release];
topView = nil;
-(IBAction)dismissKeyBoard
{
[tvTextView resignFirstResponder];
}
总结
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