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 struct
CGRect CGRect;
//origin起始点
struct CGPoint {

  CGFloat x;

  CGFloat y;

};
typedef struct
CGPoint 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 = [UIColor
brownColor];
    //subviews
获取所有子视图
    NSArray *arr = [aview
subviews];

    //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.window
viewWithTag:100].backgroundColor = [UIColor
blackColor];
3.UILabel
 

UILabel *aLable = [[UILabel
alloc] initWithFrame:CGRectMake(50,
50, 100,
100)];
    aLable.text =
@"Application windows are expected to have a root view controller at the end of application launch";
[align=left]    //文字,背景颜色[/align]
    aLable.textColor = [UIColor
redColor];
    aLable.backgroundColor = [UIColor
brownColor];
    aLable.textAlignment =
NSTextAlignmentCenter;
[align=left]    //显示行数[/align]
    aLable.numberOfLines =
0;
[align=left]    //阴影的位[/align]
    aLable.shadowColor = [UIColor
blackColor];
    aLable.shadowOffset =
CGSizeMake(2,
1);
[align=left]    //改变字体属性[/align]
[align=left]   //打印出已安装的所有字体[/align]
    NSArray *arr = [UIFont
familyNames];
    for (id obj
in arr) {
[align=left]        NSLog(@"%@",obj);[/align]
[align=left]    } [/align]
    aLable.font = [UIFont
fontWithName:@" Zapfino"
size:20];
[align=left]    //修改字体的大写[/align]

    aLable.font = [UIFont
systemFontOfSize:24];

[align=left]    //断行lineBreakMode[/align]
    aLable.lineBreakMode =
NSLineBreakByTruncatingMiddle;//以单词为单位换⾏行
[align=left]    //断行形式[/align]
    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" */
[align=left]    } NS_ENUM_AVAILABLE_IOS(6_0);[/align]
[align=left]   [/align]
    [self.window
addSubview:aLable];

[align=left]    [aLable release];[/align]
[align=left] [/align]
[align=left]
[/align]
[align=left](4).拓展(明天补充)[/align]
UITextField *loginText = [[UITextField
alloc] initWithFrame:CGRectMake(140,
100, 150,
25)];

     [self.window
addSubview: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 = [[UIButton
alloc] initWithFrame:CGRectMake(50,
400, 50,
25)];

    [btn setTitle:
@"注册"
forState: UIControlStateNormal];//设置默认状态下的文字

    [btn setTitleColor:[UIColor
blueColor] forState:UIControlStateNormal];//设置默认状态下的颜色

    btn.titleLabel.font = [UIFont
systemFontOfSize:
14.0];

    [self.window
addSubview: btn];