//

//  AppDelegate.m

//  UI2_ButtonChess

//

//  Created by zhangxueming on 15/6/30.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//

#import "AppDelegate.h"

@interface AppDelegate ()

{

    UIButton *_lastBtn; //记录上次点击的btn

}

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    [self showButtonChess];

    self.window.rootViewController = nil;

    self.window.backgroundColor = [UIColor whiteColor];

    return YES;

}

- (void)showButtonChess

{

    NSArray *titles = @[@"車",@"马",@"象",@"王",@"后",@"象",@"马",@"車"];

    CGFloat size = self.window.frame.size.width/8;

    for (int i=0; i<8; i++) {

        for (int j=0; j<8; j++) {

            UIView *view =[[UIView alloc] initWithFrame:

        CGRectMake(j*size, 100+i*size, size, size)];

            if ((i+j)%2) {

                view.backgroundColor = [UIColor yellowColor];

            }

            else

            {

                view.backgroundColor= [UIColor cyanColor];

            }

            [self.window addSubview:view];

        }

    }

    for (int i=0; i<8; i++) {

        for (int j=0; j<8; j++) {

            UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

            btn.frame = CGRectMake(j*size, 100+i*size, size, size);

            if (i==0||i==7) {

                [btn setTitle:titles[j] forState:UIControlStateNormal];

            }

            if (i==1||i==6) {

                [btn setTitle:@"兵" forState:UIControlStateNormal];

            }

            if (i==0||i==1) {

                [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

                btn.titleLabel.font = [UIFont systemFontOfSize:30];

            }

            if (i==6||i==7) {

                [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

                btn.titleLabel.font = [UIFont systemFontOfSize:30];

            }

            [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];

            [self.window addSubview:btn];

        }

    }

}

- (void)btnClick:(UIButton *)btn

{

    if (_lastBtn && ![btn.currentTitle length]) {

        CGRect frame = _lastBtn.frame;

        _lastBtn.frame = btn.frame;

        btn.frame = frame;

        _lastBtn = nil;

    }

    else if (!_lastBtn && btn.currentTitle.length)

    {

        _lastBtn = btn;

    }

    //[self.window bringSubviewToFront:btn];

}