oc UI输入数字n创建n条彩虹 IMP

RainBow.m

#import "RainBow.h"

@implementation RainBow

{

NSArray * _colorArray;

}

-(instancetype)initWithFrame:(CGRect)frame withNum:(NSInteger)
num{

self=[superinitWithFrame:frame];

if(self){

//1>
加载数据

[self_loadData];

num=num<=_colorArray.count?num:_colorArray.count;

self.backgroundColor=[UIColorwhiteColor];

//2>
加载子视图

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

UIView * view=[[UIViewalloc]
initWithFrame:CGRectMake(0,i*10,self.frame.size.width,10)];

view.backgroundColor=_colorArray[i];

[selfaddSubview:view];

}

//3>
重新自定义当前父视图的高度

frame.size.height=10*num;

self.frame=frame;

}

returnself;

}

AppDelegate.m

#import "AppDelegate.h"

int count =0;

@interface
AppDelegate ()

@end

@implementation AppDelegate

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

UIWindow * window = [[UIWindow
alloc]initWithFrame:[UIScreen
mainScreen].bounds];

window.backgroundColor = [UIColor
whiteColor];

self.window = window;

[self.window
makeKeyAndVisible];

JRRainBow * view=[[JRRainBowalloc]
initWithFrame:CGRectMake(375/2.0-170/2.0,110,
170, 100)
withNum:8];

view.tag=8;

[self.windowaddSubview:view];

}