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. }
转载于:https://www.cnblogs.com/yang-guang-girl/p/5084640.html
