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