21.View,Label,Button,TextField

1.UIView

//1.创建一个UIView的对象
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
//2.view1设置背景颜色
view1.backgroundColor = [UIColor cyanColor];
//3.把试图贴到窗口上
[self.window addSubview:view1];
//4.释放
[view1 release];
//试图添加到父视图的数组之后,数组会增加视图的引用计数,相应的也就可在添加之后对视图进行释放
//视图的坐标起始位置在父视图的左上角,一个视图可以有多个子视图,但是一个视图只能有一个父视图
//先创建的先添加到superview的视图会在层级关系的最下面,通过父视图来管理它身上所有的子视图的层级关系
[self.window bringSubviewToFront:view2];
//父视图把指定的视图放在最上面/下面
[self.window sendSubviewToBack:view2];
//透明度
view2.alpha = 0.5;
//tag不能是0,不能重复
view3.tag = 100;
//通过tag找到对应的view
UIView *tempView = [self.window viewWithTag:100];

2.UILabel

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 40, 150, 200)];
label.backgroundColor = [UIColor orangeColor];
[self.window addSubview:label];
//设置文本内容
label.text = @"fafdfasdfdasfdsa]";
//设置行数,默认是一行,设置为0是行数的最大值
label.numberOfLines = 3;
//让文本自己去适应label的尺寸,显示全部内容
[label sizeToFit];//--->**
//文本的对齐方式(默认左对齐)
label.textAlignment = NSTextAlignmentCenter;
//断行模式
label.lineBreakMode = NSLineBreakByTruncatingMiddle;
//文本内容的颜色
label.textColor = [UIColor redColor];
//阴影颜色
label.shadowColor = [UIColor redColor];
//阴影大小
label.shadowOffset = CGSizeMake(1, 2);
//设置边框
label.layer.borderWidth = 1;//--->**
//设置圆角
label.layer.cornerRadius = 5;//--->**
//隐藏多余的部分
label.layer.masksToBounds = YES;//--->**
//字体大小
label.font = [UIFont systemFontOfSize:20];
//center可以改变视图的位置
label.center = CGPointMake(150, 150);
[label release];

3.UIButton

//用button自己的便利构造器的方式来创建对象
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
//指定button的位置和大小
button.frame = CGRectMake(30, 50, 100, 30);
//设置背景颜色
button.backgroundColor = [UIColor redColor];
//给button设置标题
[button setTitle:@"点我啊" forState:UIControlStateNormal];
[button setTitle:@"hehe" forState:UIControlStateHighlighted];
//设置字体大小
button.titleLabel.font = [UIFont systemFontOfSize:18];//--->**
//设置一下边框和圆角,隐藏多余的部分
button.layer.borderWidth = 0.1;//--->**
button.layer.cornerRadius = 10;//--->**
button.layer.masksToBounds = YES;//--->**
[self.window addSubview:button];
//button不用release//--->**//--->**//--->**

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];
button1.frame = CGRectMake(40, 40, 30, 30);
//给button设置背景图片,图片大小由frame决定,填满整个frame
[button1 setBackgroundImage:[UIImage imageNamed:@"checked"] forState:UIControlStateNormal];
[self.window addSubview:button1];
[button1 addTarget:self action:@selector(chageImage:) forControlEvents:UIControlEventTouchUpInside];
self.isClick = NO;//isClick为BOOL类型的属性


UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
button2.frame = CGRectMake(120, 40, 51, 24);
//如果想使用setImage设置图片的话,button的类型要调整成custom,setImage方法不会把图片放大成按钮大小,但是如果按钮的frame比图片小,则会缩小成按钮大小
[button2 setImage:[UIImage imageNamed:@"BtnOn"] forState:UIControlStateNormal];
button2.tag = 100;
[self.window addSubview:button2];
self.isSelected = YES;//isSelected为BOOL类型的属性
//点击方法 button最重要的方法
[button2 addTarget:self action:@selector(chgngePic:) forControlEvents:UIControlEventTouchUpInside];

- (void)chageImage:(UIButton *)button
{
    if (self.isClick) {
        [button setBackgroundImage:[UIImage imageNamed:@"checked"] forState:UIControlStateNormal];
    }
    else{
        [button setBackgroundImage:[UIImage imageNamed:@"check"] forState:UIControlStateNormal];
    }
    self.isClick = !self.isClick;
}

- (void)chgngePic:(UIButton *)button//button为传送过来的一个参数
{
    if (self.isSelected) {
        [button setImage:[UIImage imageNamed:@"BtnOff"] forState:UIControlStateNormal];
    }
    else{
        [button setImage:[UIImage imageNamed:@"BtnOn"] forState:UIControlStateNormal];
    }
    self.isSelected = !self.isSelected;
}

4.UITextField

//输入框UITextFiled
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(40, 60, 200, 40)];
textField.backgroundColor = [UIColor redColor];
//加上圆角和边框,隐藏多余的部分
textField.layer.borderWidth = 1;
textField.layer.cornerRadius = 5;
label.layer.masksToBounds = YES;
//UITextField系统提供的属性
textField.borderStyle = UITextBorderStyleRoundedRect;
textField.text = @"zhangsan";
textField.textColor = [UIColor greenColor];
textField.textAlignment = NSTextAlignmentCenter;
textField.font = [UIFont systemFontOfSize:20];
//占位符,当输入是消失
textField.placeholder = @"请输入密码";
//密文输入
textField.secureTextEntry = YES;
textField.tag = 100;
//textField的清除button
textField.clearButtonMode = UITextFieldViewModeWhileEditing;
//改变键盘的类型
textField.returnKeyType = UIReturnKeySearch;
textField.keyboardType = UIKeyboardTypeNumberPad;
[self.window addSubview:textField];
[textField release];

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(40, 40, 40, 40)];
view.backgroundColor = [UIColor greenColor];
//弹出一个自定义视图,默认是键盘
textField.inputView = view;
//给键盘添加一个辅助视图
textField.inputAccessoryView = view;
//给textfield设置代理人
textField.delegate = self;