iOS开发-Day26-UILabel&UIButton&UITextField

1、UILable

@interface ViewController : UIViewController@property(strong,nonatomic) UILabel *lblName;@endViewController.m//    初始化    self.lblName=[[UILabel alloc] initWithFrame:CGRectMake(50, 100, 250, 40)];//     背景色    self.lblName.backgroundColor=[UIColor grayColor];//    文本    self.lblName.text=@"scjy.net";//    文本颜色    self.lblName.textColor=[UIColor blueColor];//    文本对齐方式//    self.lblName.textAlignment=NSTextAlignmentCenter;//    self.lblName.textAlignment=NSTextAlignmentRight;//    字体    //self.lblName.font=[UIFont systemFontOfSize:60];//    self.lblName.font=[UIFont boldSystemFontOfSize:35];//    self.lblName.font=[UIFont italicSystemFontOfSize:30];    self.lblName.font=[UIFont fontWithName:@"Farah" size:30];    [self.view addSubview:self.lblName];//   NSArray *fonts =[UIFont familyNames];//    NSLog(@"%@",fonts);//    阴影    self.lblName.shadowColor=[UIColor redColor];    self.lblName.shadowOffset=CGSizeMake(0, -0.75);//    文本显示样式   // self.lblName.lineBreakMode=NSLineBreakByTruncatingHead;//    行数//    self.lblName.numberOfLines=5;//    字体大小适宜label宽度//    self.lblName.adjustsFontSizeToFitWidth=YES;   // self.lblName.adjustsLetterSpacingToFitWidth=YES;

2、UIButton

//@property(strong,nonatomic) UIButton *btnTest;- (void)viewDidLoad {    [super viewDidLoad];//   设置按钮类型    self.btnTest=[UIButton buttonWithType:UIButtonTypeRoundedRect];//    指定位置    self.btnTest.frame=CGRectMake(100, 100, 100, 40);    self.btnTest.tag=100;//    设置标题    [self.btnTest setTitle:@"放大" forState:UIControlStateNormal];//    添加事件    [self.btnTest addTarget:self action:@selector(change) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:self.btnTest];}-(void)change{//    NSLog(@"test");//    UIButton *btn=(UIButton *)[self.view viewWithTag:100];////    获取标题//    NSString *title =[btn currentTitle];//    NSLog(@"%@",title);    NSLog(@"%@",[self.btnTest currentTitle]);}

3、UITextField

    //@property(strong,nonatomic) UITextField *txtName;- (void)viewDidLoad {    [super viewDidLoad];     //初始化    self.txtName=[[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 40)];    //设置边框类型    self.txtName.borderStyle=UITextBorderStyleLine;    //设置文字颜色    self.txtName.textColor=[UIColor redColor];    //设置默认文本    self.txtName.placeholder=@"请输入姓名";    //背景用图片填充    self.txtName.background=[UIImage imageNamed:@"logo.png"];    //键盘类型设置    //self.txtName.keyboardType=UIKeyboardTypePhonePad;    //键盘return建类型    self.txtName.returnKeyType=UIReturnKeyNext;    [self.view addSubview:self.txtName];    UIButton *btnHide=[UIButton buttonWithType:UIButtonTypeRoundedRect];    btnHide.frame=CGRectMake(230, 100, 100, 40);    [btnHide setTitle:@"完成" forState:UIControlStateNormal];    [btnHide addTarget:self action:@selector(hideKeyBoard) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btnHide];}-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    //是文本失去焦点，用来隐藏键盘    [self.txtName resignFirstResponder];}-(void)hideKeyBoard{//    隐藏键盘  文本控件失去第一响应值    [self.txtName resignFirstResponder];}

4、代理隐藏键盘

1. 在你的控制器类中，加入UITextFieldDelegate协议，如：@interface EditingPersonViewController : UIViewController<UITextFieldDelegate2. 根据协议的要求，在实现文件中加入textFieldShouldReturn方法，如：-(BOOL) textFieldShouldReturn:(UITextField *)textField {[textField resignFirstResponder];return YES;}3. 将xib文件中的TextField控件的delegate变量指向到之前使用UITextFieldDelegate协议的那个控制器类 将TextField的delegate IBOutlet变量右键链接到前面的控制器类的实例上。或者使用代码方式，指定相关TextField的delegate变量。- (void)viewDidLoad {[super viewDidLoad];itemNameField.delegate = self;priceField.delegate = self;}第三步很容易忽略，之前就因为忘记指定delegate变量，导致点击键盘的return健，键盘死活不隐藏。

//  ViewController.h#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UITextFieldDelegate>@property(strong,nonatomic) UITextField *txtName;@property(strong,nonatomic) UIButton *btnHide;@end//  ViewController.m#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.btnHide=[UIButton buttonWithType:UIButtonTypeCustom];    self.btnHide.frame=self.view.frame;    //self.btnHide.backgroundColor=[UIColor greenColor];     self.txtName=[[UITextField alloc] initWithFrame:CGRectMake(100, 100, 100, 40)];    self.txtName.borderStyle=1;//    添加代理    self.txtName.delegate=self;    [self.view addSubview:self.txtName];    [self.view addSubview:self.btnHide];    [self.btnHide addTarget:self action:@selector(hideKeyBoard) forControlEvents:UIControlEventTouchUpInside];    [self.view sendSubviewToBack:self.btnHide];}-(void)hideKeyBoard{//    当前执行的代码的行数   // NSLog(@"%d",__LINE__);//    当前指定的方法的名称   // NSLog(@"%s",__func__);    [self.txtName resignFirstResponder];}//-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event//{//    [self.txtName resignFirstResponder];//}- (BOOL)textFieldShouldReturn:(UITextField *)textField{    if ([textField isFirstResponder]) {        [textField resignFirstResponder];    }    return YES;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end