//
// AppDelegate.m
// UI2_IOS坐标系
//
// Created by zhangxueming on 15/6/29.
// Copyright (c) 2015年 zhangxueming. All rights reserved.
//
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *
)launchOptions {
// Override point for customization after application launch.
//window的默认颜色是透明色
self.window.backgroundColor =
[UIColor whiteColor];
//NSLog(@"window = %@", self.window);
NSLog(
@"x = %.2f y=%.2f w = %.2f h = %.2f",self.window.frame.origin.x, self.window.frame.origin.y, self.window.frame.size.width, self.window.frame.size.height);
//ios坐标系
//frame坐标: 相对于父视图的坐标
//bounds坐标:ios坐标(起始点从(0,0)开始)
//状态栏的高度是20
CGRect frame =
[[UIScreen mainScreen] bounds];
NSLog(@"x = %.2f y = %.2f w= %.2f h = %.2f", frame.origin.x, frame.origin.y, frame.size.width, frame.size.height);
UIWindow *window1 = [[UIWindow alloc] initWithFrame:CGRectMake(
10,
50, self.window.frame.size.width-
20, self.window.frame.size.height-
100)];
window1.backgroundColor =
[UIColor cyanColor];
[self.window addSubview:window1];
//使window1在最上层显示
[window1 makeKeyAndVisible];
//通常一个应用程序有一个Window(窗口)
//相当于一个容器
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(
20,
100, self.window.frame.size.width-
40,
50)];
view1.backgroundColor =
[UIColor redColor];
[self.window addSubview:view1];
//view1的retainCount加1
//NSLog(@"retainCount = %li", view1.retainCount);
self.window.rootViewController =
nil;
return YES;
}
转载于:https://www.cnblogs.com/0515offer/p/4638219.html
