1 // 2 // UIColor+Radom.h 3 // 七彩方块 4 // 5 // Created by 大欢 on 16/1/18. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import <UIKit/UIKit.h> 10 11 @interface UIColor (Radom) 12 13 + (UIColor *)Random; 14 15 @end
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1 // 2 // UIColor+Radom.m 3 // 七彩方块 4 // 5 // Created by 大欢 on 16/1/18. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import "UIColor+Radom.h" 10 11 @implementation UIColor (Radom) 12 13 + (UIColor *)Random { 14 15 NSInteger r = arc4random()%255; 16 NSInteger g = arc4random()%255; 17 NSInteger b = arc4random()%255; 18 NSInteger a = arc4random()%10; 19 20 return [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a/10.0f]; 21 } 22 23 @end
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1 // 2 // ViewController.m 3 // 七彩方块 4 // 5 // Created by 大欢 on 16/1/18. 6 // Copyright © 2016年 bjsxt. All rights reserved. 7 // 8 9 #import "ViewController.h" 10 #import "UIColor+Radom.h" 11 12 @interface ViewController () 13 14 @end 15 16 @implementation ViewController 17 18 - (void)viewDidLoad { 19 [super viewDidLoad]; 20 21 [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(addColorBlock) userInfo:nil repeats:YES]; 22 23 } 24 25 - (void)addColorBlock { 26 27 UIView * v = [[UIView alloc] init]; 28 v.frame = CGRectMake([self randomVar1], [self randomVar2], [self randomSize], [self randomSize]); 29 v.backgroundColor = [UIColor Random]; 30 [self.view addSubview:v]; 31 } 32 33 - (NSInteger)randomVar1 { 34 return arc4random()%400; 35 } 36 37 - (NSInteger)randomVar2 { 38 return arc4random()%700; 39 } 40 41 - (NSInteger)randomSize { 42 return arc4random()%100 + 50; 43 } 44 45 - (void)didReceiveMemoryWarning { 46 [super didReceiveMemoryWarning]; 47 // Dispose of any resources that can be recreated. 48 } 49 50 @end
