18.小项目：应用市场 版本1.0

从最一般的思路来尝试创作这个项目：一个一个地创建view。 

 

------------- ViewController.m -------------

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    

    [super viewDidLoad];

    CGFloat appW = 100;

    CGFloat appH = 100;

    CGFloat marginX = (self.view.frame.size.width - appW * 3) / 4;

    CGFloat marginY = 10;

    

    UIView *view00 = [[UIView alloc] init];

    view00.backgroundColor = [UIColor redColor];

    CGFloat v00x = marginX;

    CGFloat v00y = 20 + marginY;

    view00.frame = CGRectMake(v00x, v00y, appW, appH);

    [self.view addSubview:view00];

    UIView *view01 = [[UIView alloc] init];

    view01.backgroundColor = [UIColor redColor];

    CGFloat v01x = marginX + appW + marginX;

    CGFloat v01y = 20 + marginY;

    view01.frame = CGRectMake(v01x, v01y, appW, appH);

    [self.view addSubview:view01];

    UIView *view02 = [[UIView alloc] init];

    view02.backgroundColor = [UIColor redColor];

    CGFloat v02x = marginX + (appW + marginX) * 2;

    CGFloat v02y = 20 + marginY;

    view02.frame = CGRectMake(v02x, v02y, appW, appH);

    [self.view addSubview:view02];

    

    UIView *view03 = [[UIView alloc] init];

    view03.backgroundColor = [UIColor redColor];

    CGFloat v03x = marginX ;

    CGFloat v03y = 20 + marginY + appH + marginY;

    view03.frame = CGRectMake(v03x, v03y, appW, appH);

    [self.view addSubview:view03];

}

@end