//视图曾经加载完了，能够进行ui的增加了- (void)viewDidLoad { [superviewDidLoad]; // Do any additional setup after loading the view. //初始化UILabel留神指定该对象的地位及大小 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]; //设置文字色彩 lb.textColor = [UIColorwhiteColor]; //文字大小，文字字体 lb.font = [UIFontsystemFontOfSize:25]; NSLog(@"零碎字体名字：%@",lb.font.familyName); //打印文字字体列表 NSArray *arrFonts = [UIFontfamilyNames]; NSLog(@"零碎字体列表：%@",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残缺单词换行（若不够一个单词的地位）// 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为不限度行树，能够指定具体的数字 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; //加边框色彩，宽度，留神给layer加的色彩是CGColor类型 lb.layer.borderColor = [[UIColorredColor]CGColor]; lb.layer.borderWidth =1.0; //把label增加到视图上，并且会显示 [self.viewaddSubview:lb];}Label的首行缩进始终是个很头疼的问题，当初IOS6只有有一个 attributedText的属性值得咱们深究，能够达到咱们自定义的行高，还有首行缩进，各种行距和距离问题。上面这个是两个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视图展现层
- ( void )viewDidLoad {self . usernameLabel . text = @"用户名Jordan CZ: " ;self . usernameLabel . adjustsFontSizeToFitWidth = YES ;[ self . usernameLabel sizeToFit ]; self . contentLabel . text = @"首行缩进依据用户昵称主动调整 距离可自定依据需要随便扭转。。。。。。。" ;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 依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的应用详解
//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容许滑动，默认为“YES” textview.editable = YES; //是否容许编辑内容，默认为“YES” textview.delegate = self; //设置代理办法的实现类 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; //文本显示的地位默认为居左 textview.dataDetectorTypes = UIDataDetectorTypeAll; //显示数据类型的连贯模式（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的代理办法如下:
//将要开始编辑- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;//将要完结编辑- (BOOL)textViewShouldEndEditing:(UITextView *)textView;//开始编辑- (void)textViewDidBeginEditing:(UITextView *)textView;//完结编辑- (void)textViewDidEndEditing:(UITextView *)textView;//内容将要产生扭转编辑- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text;//内容产生扭转编辑- (void)textViewDidChange:(UITextView *)textView;//焦点产生扭转- (void)textViewDidChangeSelection:(UITextView *)textView;有时候咱们要控件自适应输出的文本的内容的高度，只有在textViewDidChange的代理办法中退出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]; //从新调整textView的高度 textView.frame =CGRectMake(textView.frame.origin.x,textView.frame.origin.y,textView.frame.size.width,sizeFrame.height+5);}管制输出文字的长度和内容，可通调用以下代理办法实现
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text{ if (range.location>=100) { //管制输出文本的长度 return NO; } if ([text isEqualToString:@"\n"]) { //禁止输出换行 return NO; } else { return YES; }}UITextView退出键盘的几种形式
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须要本人实现，有如下几种形式：
1）如果你程序是有导航条的，能够在导航条下面加多一个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里不必回车键，能够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）还有你也能够自定义其余加载键盘下面用来退出，比方在弹出的键盘下面加一个view来搁置退出键盘的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];}最初举荐个我的iOS交换群：642363427 有一个独特的圈子很重要，结识人脉！外面都是iOS开发，全栈倒退，欢送入驻，共同进步！（群内会收费提供一些群主珍藏的收费学习书籍材料以及整顿好的几百道面试题和答案文档！）