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[操作系统]【代码笔记】淡出淡入效果


一,效果图。

二,工程图。

三,代码.

ViewController.h

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end

 

ViewController.m

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#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view, typically from a nib.    //UIView  UIView *view=[[UIView alloc]initWithFrame:CGRectMake(10, 100, 200, 200)];  view.backgroundColor=[UIColor redColor];  [self.view addSubview:view];    //淡出  //[self fadeOut:view];    //淡入  //[self fadeIn:view];  }//淡出-(void) fadeOut:(UIView *)view{  CGContextRef context = UIGraphicsGetCurrentContext();  [UIView beginAnimations:nil context:context];  [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];  [UIView setAnimationDuration:0.3];  [view setAlpha:0.0f];  [UIView commitAnimations];}//淡入-(void) fadeIn:(UIView *)view{  CGContextRef context = UIGraphicsGetCurrentContext();  [UIView beginAnimations:nil context:context];  [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];  [UIView setAnimationDuration:0.3];  [view setAlpha:1.0f];  [UIView commitAnimations];}- (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}
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