Lesson01UIView 用户界面

上课代码

<span style="font-size:18px;">    //UI: User Interface, 用户界面    //UIWindow, 窗口类, 所有的控件必须放到window上才能显示, 一个iOS应用至少要有一个窗口, 继承于UIView    //iOS手机中的坐标系, 不同于数学中笛卡尔坐标系, 原点在左上角, X轴: 向右越来越大, y轴: 向下越来越大        //与坐标系相关的数据类型        //CGPoint, 结构体, 用于存放一个点的坐标    CGPoint point = CGPointMake(10, 100);    NSLog(@"%lf, %.2lf",point.x, point.y);    NSLog(@"%@",NSStringFromCGPoint(point));    //  CGSize, 结构体, 用于存放矩形的宽和高    CGSize size = CGSizeMake(150, 200);    NSLog(@"%lf, %.2lf",size.width, size.height);    NSLog(@"%@",NSStringFromCGSize(size));        //CGRect, 结构体, 用于存放一个矩形的位置和大小    CGRect rect = CGRectMake(10, 100, 150, 200);    NSLog(@"%.2lf, %.2lf, %.2lf, %.2lf",rect.origin.x, rect.origin.y, rect.size.width,rect.size.height);    NSLog(@"%@",NSStringFromCGRect(rect));        // [[UIScreen mainScreen] bounds], 主屏幕的大小    //[UIScreen mainScreen], 获取到主屏幕    //UIScreen, 屏幕类        NSLog(@"%@",NSStringFromCGRect([[UIScreen mainScreen] bounds]));    //屏幕大小(单位:pt, point)    //1, 3g, 3gs, 4, 4s: [320 * 480]    //5, 5s, 5c: [320 * 568]    //6, 6s: [375 * 667]    //6Plus, 6s Plus: [414 * 736]        //创建一个和屏幕一样大小的window对象    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.        //UIColor, 颜色类, 继承于NSObject, 用于展示一种颜色    //RBGA,(红,蓝,绿,不透明度) 0~1    UIColor *color = [UIColor colorWithRed:1.000 green:0.649 blue:0.533 alpha:1.000]; //  OMColorSense插件,设置颜色            //设置背景颜色    self.window.backgroundColor = [UIColor yellowColor];    //让当前的窗口成为主窗口, 并显示    [self.window makeKeyAndVisible];    //ARC->MRC    //1.gar    //2.strong    //3.重写dealloc    //4.window, autorelease        //UIView, 继承于UIResponder, 一个矩形区域, 所有控件都是继承于UIView, 用户在手机上能够看到的都是UIView或者UIview的子类    //创建一个视图的步骤:    //1.创建视图, 并给定其位置和大小    UIView *aView = [[UIView alloc] initWithFrame:CGRectMake(10, 30, 100, 200)];        //2.设置视图属性    //颜色    aView.backgroundColor = [UIColor yellowColor];    //是否隐藏    aView.hidden = YES;    //不透明度    aView.alpha = 0.5;        //3.添加到window上    //所有的视图都要放到window上才能显示    [self.window addSubview:aView];        //4.释放视图    [aView release];    //    UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];//    redView.backgroundColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:1];//    redView.hidden = NO;//    redView.alpha = 1;//    [self.window addSubview:redView];//    [redView release];//    //    UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];//    blueView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:1];//    blueView.hidden = NO;//    blueView.alpha = 1;//    [self.window addSubview:blueView];//    [blueView release];////    UIView *greenView = [[UIView alloc] initWithFrame:CGRectMake(150, 150, 100, 100)];//    greenView.backgroundColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:1];//    greenView.hidden = NO;//    greenView.alpha = 1;//    [self.window addSubview:greenView];//    [greenView release];        //    CGFloat p = 0;//    while (p <= 375) {//        UIView *radomView = [[UIView alloc] initWithFrame:CGRectMake(p, p, 100, 100)];////        radomView.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255. green:arc4random() % 256 / 255. blue:arc4random() % 256 / 255. alpha:1.0];//        radomView.hidden = NO;//        [self.window addSubview:radomView];//        [radomView release];//        p += 50;////    }//    for (NSInteger i = 0; i < 30; i++) {//        CGFloat x = arc4random() % (375 - 10 + 1) / 1.0;//        CGFloat y = arc4random() % (667 - 10 + 1) / 1.0;//        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(x, y, 10, 100)];//        view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 / 255. green:arc4random() % 256 / 255. blue:arc4random() % 256 / 255. alpha:1.0];//    }        //视图的层级关系    //1.越晚添加的视图,显示在最前面    //2.一个视图只能有一个字视图, 但是可以有多个子视图    //3.一个视图的位置, 是相对于他的父视图计算的            UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 300, 300)];    redView.backgroundColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:1];    redView.hidden = NO;    [self.window addSubview:redView];    [redView release];        UIView *blueView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];    blueView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:1];    //超出父视图部分是否切除, 默认NO    blueView.clipsToBounds = YES;    blueView.hidden = NO;    //redView为blueView的父视图    [redView addSubview:blueView];    [blueView release];        UIView *greenView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];    greenView.backgroundColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:1];    greenView.hidden = NO;    //超出父视图的部分被无情切除    [blueView addSubview:greenView];    [greenView release];            NSLog(@"%@",redView.superview);    NSLog(@"%@", redView.subviews);    //center, 基于父视图的坐标系, 视图中心点在父视图坐标系中的位置    NSLog(@"%@", NSStringFromCGPoint(redView.center));//转成字符串打印    NSLog(@"%@", NSStringFromCGPoint(blueView.center));//基于父视图的坐标系,转成字符串打印        //fram, 基于父视图坐标系, 视图在父视图坐标系中的位置和大小    NSLog(@"%@",NSStringFromCGRect(redView.frame));//基于父视图坐标系    NSLog(@"%@",NSStringFromCGRect(blueView.frame));    //bounds, 基于自身坐标系, 视图在自身坐标系的位置和大小, 默认值{0,0,w,h}    NSLog(@"%@",NSStringFromCGRect(redView.bounds));        //UIView属性    //1.backgroundColor    //2.hidden    //3.alpha    //4.superview    //5.subviews    //6.    //7.center    //8.frame    //9.bounds</span>