【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

#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.
}