- 效果图
12.gif
ed.gif
原理
先创建一个UIViewController并且将根视图控制器给它,再将图片按顺序加入控制器的视图中，并把图片视图的透明度设置为0，还要把所有视图依次加入一个图片数组中，然后设置一个定时器，按顺序把图片的透明度调为1，当最后一个图片显示时，结束定时器，并把根视图交给主界面代码
#import "LauchViewController.h"
#import "Common.h"
#import "MainTabBarController.h"
@interface LauchViewController ()
{
NSMutableArray *imageViews;//图片数组
int count;//计数count
}
@end
@implementation LauchViewController
- (void)viewDidLoad {
[super viewDidLoad];
count = 0;
self.view.backgroundColor = [UIColor orangeColor];
[self _createBackImageView];
[self _createImageViews];
//2 定时器的调用
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(startAnimation:) userInfo:nil repeats:YES];
}
//创建背景图片
-(void)_createBackImageView{
UIImageView *backImageV = [[UIImageView alloc]initWithFrame:self.view.bounds];
backImageV.image = [UIImage imageNamed:@"Default"];
[self.view addSubview:backImageV];
}
//定时器调用的方法
-(void)startAnimation:(NSTimer*)timer{
if (count == imageViews.count) {
//定时器停止
[timer invalidate];
//显示主界面
UIStoryboard *storyB = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
MainTabBarController *maintabBarC =[storyB instantiateInitialViewController];
self.view.window.rootViewController = maintabBarC;
}else{
[UIView animateWithDuration:0.1 animations:^{
UIImageView *imageV = imageViews[count];
imageV.alpha = 1;
}];
}
count++;
}
//创建图片视图
-(void)_createImageViews{
//创建图片数组
imageViews = [NSMutableArray array];
CGFloat width = KScreenWidth/4;
CGFloat height= KScreenHeight/6;
CGFloat x = 0;
CGFloat y = 0;
//循环创建24张图片视图
for (int i = 0; i<24; i++) {
NSString *imageName = [NSString stringWithFormat:@"%d.png",i+1];
UIImage *image = [UIImage imageNamed:imageName];
UIImageView *imageView = [[UIImageView alloc]initWithImage:image];
imageView.alpha = 0;
imageView.frame =CGRectMake(0, 0, width, height);
if (i<4) {//前四张
x = i*width;
y = 0;
}else if (i<8){//最右边的四张
x =3*width;
y =height*(i-3);
}else if (i<12){//最下面的四张
//x =KScreenWidth-width*1;
x =KScreenWidth-width*(i-7);
y = KScreenHeight-height;
}else if (i<16){//最左边的四张
x = 0;
y = KScreenHeight-height*(i-10);
}else if (i<18){//上边2个
x = width*(i-15);
y =height;
}else if (i<20){//右边2个
x = width*2;
y = height*(i-16);
}else if (i<22){//下面2个
x = KScreenWidth-width*(i-18);
y = KScreenHeight-height*2;
}else if (i<24){//最后2个
x = width;
y = KScreenHeight-height*(i-19);
}
imageView.origin = CGPointMake(x, y);
//按照顺序将图片放在图片数组中
[imageViews addObject:imageView];
[self.view addSubview:imageView];
}
}
