UI基础学习第一天

//创建并初始化window,给定屏幕大小self.window = [UIWindow alloc]initWithFrame:[[UIScreen mainScreen].bounds]//设置背景颜色self.window setBackgroundColor: [UIColorcolorWithRed:243/255.0green:208/255.0blue:56/255.0alpha:1]]//作为主window并且显示[self.windowmakeKeyAndVisible];//设置根视图控制器[self.windowsetRootViewController:[UIViewControllernew]];//将某一个子视图放到最后面////    [self.window sendSubviewToBack:view2];//    //将一个子视图移到最前面////    [self.window bringSubviewToFront:view1];//    //交换视图//    [self.window exchangeSubviewAtIndex:0 withSubviewAtIndex:1];//    //从父视图移除////    [view2 removeFromSuperview];//中心点    View.center = CGPointMake(self.window.frame.size.width/2, self.window.frame.size.height/2);   //控制视图显隐    View.hidden =NO;//(是否隐藏)    //控制视图透明度    View.alpha = 1;//(0-1之间)    //标签    View.tag = 101;  //用来做标记的    //获取父视图(获取的是视图(强转))    UIWindow *window = (UIWindow *)View.superview;    //获取子视图(用数组)    NSArray *array = View.subviews;//    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 100)];//    label.center = CGPointMake(self.window.bounds.size.width/2, self.window.bounds.size.height/2);//    //设置label的颜色//    label.backgroundColor = [UIColor whiteColor];//    //设置label文本//    label.text = @"人生若只如初见,何事秋风悲画扇,等闲变却故人心,却道故人心易变.";//    //文本对齐方式//    label.textAlignment = NSTextAlignmentCenter;//    //文本颜色//    label.textColor = [UIColor magentaColor];//    //文本字体大小////    label.font = [UIFont fontWithName:@"" size:22.0];//    label.font = [UIFont systemFontOfSize:25];//    //文本阴影//    label.shadowOffset = CGSizeMake(2, -2);//偏移量//    label.shadowColor = [UIColor cyanColor];//阴影颜色//    //文本边框//    label.layer.borderWidth = 3;//边框宽度//    label.layer.borderColor = [UIColor redColor].CGColor;//边框颜色//    //文本圆角//    label.layer.cornerRadius = 10;//内切圆半径//    label.layer.masksToBounds = YES;//切除多余部分//    //设置文本行数//    label.numberOfLines= 4;//    //文本换行模式//    label.lineBreakMode= NSLineBreakByWordWrapping;//    //添加到父视图//    [self.window addSubview:label];   //旋转//    sh.transform = CGAffineTransformMakeRotation(M_PI);