IOS学习笔记（一）UIFirst

 1 @interface HelloNameAppDelegate : UIResponder <UIApplicationDelegate> 
 2 {
 3     UITextField *_firstNumTF;//TF是textfield的缩写
 4     UITextField *_secondNumTF;
 5     UILabel *_resultLable;
 6     //UIButton *_calculateBT;
 7 }
 8 @property (strong, nonatomic) UIWindow *window;
 9 
10 @end

.m代码

 1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 2 {
 3     self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
 4     // Override point for customization after application launch.
 5     self.window.backgroundColor = [UIColor grayColor];
 6     
 7     //UItextFiled 用于接受用户（少量文字）的UI控件
 8     _firstNumTF = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 80, 30)];
 9     _firstNumTF.borderStyle = UITextBorderStyleRoundedRect;//边框类型
10     _firstNumTF.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;//垂直方向居中对齐
11     _firstNumTF.clearsOnBeginEditing = NO;//带ing的属性值一般是BOOL型,重新编辑时是否重新呼出键盘
12     _firstNumTF.keyboardType = UIKeyboardTypeNumberPad;//键盘类型
13     _firstNumTF.autocapitalizationType = UITextAutocapitalizationTypeNone;//首字母自动大小写
14     _firstNumTF.autocorrectionType = UITextAutocorrectionTypeNo;//自动纠错
15     _firstNumTF.textAlignment = UITextAlignmentRight;
16     //_firstNumTF.a
17     [self.window addSubview:_firstNumTF];
18     
19     UILabel *addLable = [[UILabel alloc]initWithFrame:CGRectMake(90, 50, 30, 30)];
20     addLable.text = @"+";
21     addLable.font = [UIFont fontWithName:@"BodoniOrnamentsITCTT" size:30];
22     addLable.textAlignment = UITextAlignmentCenter;
23     addLable.textColor = [UIColor orangeColor];
24     addLable.backgroundColor = [UIColor clearColor];//背景色通常设置为clearColor
25     [self.window addSubview:addLable];
26     
27     _secondNumTF = [[UITextField alloc]initWithFrame:CGRectMake(120, 50, 80, 30)];
28     _secondNumTF.borderStyle = UITextBorderStyleRoundedRect;
29     [self.window addSubview:_secondNumTF];
30     
31     UILabel *equalLable = [[UILabel alloc]initWithFrame:CGRectMake(200, 50, 30, 30 )];
32     equalLable.text = @"=";
33     equalLable.font = [UIFont fontWithName:@"BodoniOrnamentsITCTT" size:30];
34     equalLable.textAlignment = UITextAlignmentCenter;
35     equalLable.textColor = [UIColor orangeColor];
36     equalLable.backgroundColor = [UIColor purpleColor];
37     equalLable.shadowColor = [UIColor blueColor];//阴影颜色
38     equalLable.shadowOffset = CGSizeMake(5, 5);//阴影偏移，向右，向下偏为正数
39     [self.window addSubview:equalLable];
40     
41     _resultLable = [[UILabel alloc]initWithFrame:CGRectMake(230, 50, 80, 30)];
42     _resultLable.text = @"";
43     [self.window addSubview:_resultLable];
44     //button本身包含UIImage UIButton UIImage三层
45     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
46     button.frame = CGRectMake(100, 100, 120, 40);
47     [button setTitle:@"计算" forState:UIControlStateNormal];
48     [button setTitle:@"BINGGO" forState:UIControlStateHighlighted];
49     [button addTarget:self action:@selector(buttonTapped) forControlEvents:UIControlEventTouchUpInside];
50     [self.window addSubview:button];
51     
52     [self.window makeKeyAndVisible];
53     return YES;
54 }
55 
56 -(void)buttonTapped
57 {
58     float first = [_firstNumTF.text floatValue];
59     float second = [_secondNumTF.text floatValue];
60     float result = first + second;
61     _resultLable.text = [NSString stringWithFormat:@"%g",result];//浮点数结果 去掉后面无意义的0
62     //[_firstNumTF resignFirstResponder];//取消第一响应者,回收键盘
63     //[_secondNumTF resignFirstResponder];//取消第一响应者
64    // UITextFieldDelegate
65 }

效果：