UIView背景渐变三种方法

//此作品非原创

 

 

 

#import "ACViewController.h"

 

@interface ACViewController ()

 

@end

 

@implementation ACViewController

 

- (void)viewDidLoad

{

    

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    

    

    //三种方法实现颜色渐变，效果一样

    self.view.backgroundColor=[UIColor blackColor];

    CGFloat a1=1.0;

    //第一种方法

    for (double i=0; i<<span style="color: #0433ff">460; i++) {

        a1=(i/460);

        

        UIView *view1=[[UIViewalloc]initWithFrame:CGRectMake(0.0, i, 110.0, 1)];

        view1.backgroundColor=[UIColor colorWithRed:1.0green:a1 blue:a1 alpha:1.0];

        [self.view addSubview:view1];

        [view1 release];

    }

    //第二种方法

    for (double i=0; i<<span style="color: #0433ff">460; i++) {

        a1=1-(i/460);

        

        UIView *view1=[[UIViewalloc]initWithFrame:CGRectMake(110.0, i, 105.0, 1)];

        view1.backgroundColor=[UIColor colorWithRed:0.0green:a1 blue:0.0 alpha:1.0];

        [self.view addSubview:view1];

        [view1 release];

    }

    //第三种方法

    for (double i=0; i<<span style="color: #0433ff">460; i++) {

        a1=(i/460);

        

        UIView *view1=[[UIViewalloc]initWithFrame:CGRectMake(215.0, i, 105.0, 1)];

        view1.backgroundColor=[UIColor colorWithRed:0.0green:0.0 blue:1.0 alpha:a1];

        [self.view addSubview:view1];

        [view1 release];

    }

 

 

}

 

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

 

@end