UI第一天

1.UIView和所有继承自UIView的子类的对象创建的过程

/*

     1.初始化UIView的对象UIView *MyView = [[UIView alloc] 初始化方法];
     2.设置属性,颜色尺寸等
     3.把视图加载到窗口上
     4.释放对象
     */
   

    //子视图的起始点是指的是其[父视图的起始点]开始计算

    UIView *aview = [[UIView alloc] initWithFrame:CGRectMake(50,50,200,50)];//x,y,宽,高

    aview.backgroundColor = [UIColor blackColor];

    [self.window addSubview:aview];//把视图加载到窗口上,那么window就是view的父视图

    [aview release];

//============================

2.UIView 的frame,center,bounds属性

(1).frame 是CGRect类型,有x,y,宽,高

struct CGRect {
  CGPoint origin;
  CGSize size;
};

typedef structCGRect CGRect;

//origin起始点

struct CGPoint {
  CGFloat x;
  CGFloat y;
};

typedef structCGPoint CGPoint;

//尺寸大小

struct CGSize {

  CGFloat width;
  CGFloat height;

};

(2).center代表中心点

center.x = frame.origin.x + frame.size.width/2;

center.y = frame.origin.y + frame.size.height/2;

(3).bounds属性

 /*bounds 默认的起始点是(0,0)宽高和frame的相同,修改父视图的bounds就是
     1修改了子视图的坐标系,
     2.父视图没有变化,
     3.原来的坐标系的(0,0)点变化,如改成了(10,10),即改变bounds
     4.寻找现在的(0,0)点,子视图根据新的坐标原点发生变化

     */

aview.bounds = CGRectMake(10, 10, 100, 100);//这里aview是其他两个子类view的属性

子类视图将会向左向上分别移动10个单位

2.常用属性

//NSStringFrom...把不同类型的数据转成NSString

  NSLog(@"%@",NSStringFromCGPoint(aview.center ));

//hidden视图隐藏,如果该视图被隐藏其子视图也被隐藏

  aview.hidden = YES;

//alpha透明度,设置视图的透明度0-1之间,1是不透明,依次递减,子视图的透明度随其父视图的透明度而改变
    aview.alpha = 0.8;
    //superview 获取父视图
    [dview superview].backgroundColor = [UIColorbrownColor];

    //subviews 获取所有子视图

    NSArray *arr = [aviewsubviews];

    //提前给视图添加一个标签
    aview.tag = 100;
    //利用tag值取出子视图(必须是标记视图的父视图调用viewWithTag方法)

    [self.windowviewWithTag:100].backgroundColor = [UIColorblackColor];

3.UILabel

 

UILabel *aLable = [[UILabelalloc] initWithFrame:CGRectMake(50,50, 100, 100)];

    aLable.text = @"Application windows are expected to have a root view controller at the end of application launch";

    //文字,背景颜色

    aLable.textColor = [UIColorredColor];

    aLable.backgroundColor = [UIColorbrownColor];

    aLable.textAlignment = NSTextAlignmentCenter;

    //显示行数

    aLable.numberOfLines = 0;

    //阴影的位

    aLable.shadowColor = [UIColorblackColor];

    aLable.shadowOffset = CGSizeMake(2, 1);

    //改变字体属性

   //打印出已安装的所有字体

    NSArray *arr = [UIFontfamilyNames];

    for (id objin arr) {

        NSLog(@"%@",obj);

    } 

    aLable.font = [UIFontfontWithName:@" Zapfino"size:20];

    //修改字体的大写

    aLable.font = [UIFontsystemFontOfSize:24];

    //断行lineBreakMode

    aLable.lineBreakMode = NSLineBreakByTruncatingMiddle;//以单词为单位换⾏行

    //断行形式

    typedef NS_ENUM(NSInteger, NSLineBreakMode) {        /* What to do with long lines */

        NSLineBreakByWordWrapping = 0,         /* Wrap at word boundaries, default */

        NSLineBreakByCharWrapping,       /* Wrap at character boundaries */

        NSLineBreakByClipping,      /* Simply clip */

        NSLineBreakByTruncatingHead,     /* Truncate at head of line: "...wxyz" */

        NSLineBreakByTruncatingTail,     /* Truncate at tail of line: "abcd..." */

        NSLineBreakByTruncatingMiddle    /* Truncate middle of line:  "ab...yz" */

    } NS_ENUM_AVAILABLE_IOS(6_0);

   

    [self.windowaddSubview:aLable];

    [aLable release];

 

(4).拓展(明天补充)

UITextField *loginText = [[UITextFieldalloc] initWithFrame:CGRectMake(140,100, 150, 25)];
     [self.windowaddSubview:loginText];
    loginText.borderStyle = UITextBorderStyleRoundedRect;//边框类型
    loginText.placeholder = @"请输入密码";//默认显示的文字

    loginText.clearButtonMode = UITextFieldViewModeWhileEditing;//编辑的删除按钮

 UIButton * btn = [[UIButtonalloc] initWithFrame:CGRectMake(50,400, 50, 25)];
    [btn setTitle: @"注册"forState: UIControlStateNormal];//设置默认状态下的文字
    [btn setTitleColor:[UIColorblueColor] forState:UIControlStateNormal];//设置默认状态下的颜色
    btn.titleLabel.font = [UIFontsystemFontOfSize: 14.0];
    [self.windowaddSubview: btn];