标签：
UITextField
- UITextField(输入框):是控制文本输入和显示的控件，在App中UITextField出现频率也比较高。
- Ios系统借助虚拟键盘实现输入，当点击输入框，系统会自动调出键盘，方便你进一步操作。在你不需要输入的时候，可以使用回收键盘的方法，收回弹出的键盘。
- UITextField和UILabel相比，UILabel主要用于文字显示，不能编辑，UITextField允许用户编辑文字（输入）
文本显示
外观控制
UIButton
- UIButton（按钮）：是响应用户点击的控件。在App中UIButton是出现频率很高的空间。
- UIButton与UILabel、UITextField侧重点不同，侧重于处理点按。当然UIButton类也提供了一些方法控制按钮外观。
事件
外观控制
delegate
点return回收键盘步骤：
- 将AppDelete作为UITextField的delegate
- AppDelete.h文件接受UITextFieldDelegate协议
- AppDelete.m文件实现textFieldShouldReturn：方法
//UITextField工程
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
self.window.backgroundColor = [UIColor whiteColor];
UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 100, 200, 30)];
textField.backgroundColor = [UIColor greenColor];
[self.window addSubview:textField];
//要显示的文本
textField.text = @"账号";
//显示文本内容的颜色
textField.textColor = [UIColor redColor];
//文本的对齐方式
textField.textAlignment = NSTextAlignmentCenter;
//文本字体
textField.font = [UIFont fontWithName:@"Helvetica- Bold" size:20];
//占位字符串
textField.placeholder = @"请输入";
//是否允许输入
textField.enabled = YES;
//是否开始输入的时候清空输入框内容
textField.clearsOnBeginEditing = YES;
//是否文字以圆点格式显示
textField.secureTextEntry = YES;
//弹出键盘的类型（枚举值）
textField.keyboardType = UIKeyboardTypeASCIICapable;
//键盘右下?return按钮类型(枚举值)
textField.returnKeyType = UIReturnKeySend;
//?定义输入视图(默认是键盘)
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
view.backgroundColor = [UIColor redColor];
textField.inputView = view;
//输?视图上方的辅助视图(默认nil)
UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
view1.backgroundColor = [UIColor blueColor];
textField.inputAccessoryView = view1;
//边框样式(枚举值)
textField.borderStyle = UITextBorderStyleRoundedRect;
//清除按钮模式(枚举值)
textField.clearButtonMode = UITextFieldViewModeAlways;
//输?入框左视图
UIView *leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 10, 10)];
leftView.backgroundColor = [UIColor purpleColor];
textField.leftView = leftView;
//左视图的显?模式
textField.leftViewMode = UITextFieldViewModeAlways;
//输入框右视图
UIView *rightView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
rightView.backgroundColor = [UIColor purpleColor];
textField.rightView = rightView;
//右视图的显?模式
textField.rightViewMode = UITextFieldViewModeAlways;
//提示信息窗口
UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"提示" message:@"请保护好你的账号密码" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];
[av show];
[self.window makeKeyAndVisible];
return YES;
}
//UIButton工程
#import "AppDelegate.h"
#define KRandom arc4random()%256/255.0
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self createButton];
[self.window makeKeyAndVisible];
return YES;
}
-(void)createButton{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(50, 100, 60, 40);
button.backgroundColor = [UIColor redColor];
[self.window addSubview:button];
//为按钮添加事件,指定按钮点击之后,执?target的action方法
[button addTarget:self action:@selector(login:) forControlEvents:UIControlEventTouchUpInside];
//设置指定状态下的标题
[button setTitle:@"登录" forState:UIControlStateNormal];
[button setTitle:@"coco" forState:UIControlStateSelected];
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];
//获取指定状态下的标题
// NSString *nomalTitle = [button titleForState:UIControlStateNormal];
//设置指定状态下的前景图片
[button setImage:[UIImage imageNamed:@"4])33F4VWI`Y3]TSK3UTHQ6.jpg"] forState:UIControlStateNormal];
//获取指定状态下的前景图片
UIImage *normalImage = [button imageForState:UIControlStateNormal];
NSLog(@"%@",normalImage);
}
-(void)login:(UIButton *)sender{
NSLog(@"正在登录");
//点击按钮更换背景颜色
self.window.backgroundColor = [UIColor colorWithRed:KRandom green:KRandom blue:KRandom alpha:1];
//移除按钮的点击事件
// [sender removeTarget:self action:@selector(login) forControlEvents:UIControlEventTouchUpInside];
}
//Delegate工程
#import <UIKit/UIKit.h>
//第二步
//<协议>---遵守
@interface AppDelegate : UIResponder <UIApplicationDelegate,UITextFieldDelegate>
@property (strong, nonatomic) UIWindow *window;
@end
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
self.window.backgroundColor = [UIColor whiteColor];
UITextField *textfield = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 100, 30)];
textfield.backgroundColor = [UIColor greenColor];
[self.window addSubview:textfield];
//第一步
//设置代理
textfield.delegate = self;
[self.window makeKeyAndVisible];
return YES;
}
//第三步
//键盘回收
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
//程序运行的步骤
- (void)applicationWillResignActive:(UIApplication *)application {
NSLog(@"-----将要取消活跃状态");
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
NSLog(@"-----程序已经进入后台");
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
NSLog(@"-----程序已经进入后");
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
NSLog(@"-----程序已经进?入活跃状态");
}
- (void)applicationWillTerminate:(UIApplication *)application {
NSLog(@"-----结束运行");
}
@end
UI基础-UITextField UIButton delegate
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原文地址：http://www.cnblogs.com/YDBBK/p/4792170.html
