思路
在一个新的UIWindow的最上层添加一个控制器 用SDWebImage异步加载从接口获取的图片，把图片平铺在这个控制器上。最后配合UIView的渐隐动画再几秒后移除这个控制器注意
为了不对Appdelegate有更多的入侵 我们写了一个UIWindow的Category，命名为Expand在Appdelegate的中
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:kScreenBounds];
self.mainViewController = [[MainController alloc] init];
self.window.rootViewController = self.mainViewController;
[self.window makeKeyAndVisible];
[self.window showLanuchPageAndSetUmeng];
return YES;
}
- 在UIWindow+Expand中
- (void)showLanuchPageAndSetUmeng{
LaunchViewController *launchVC = [[LaunchViewController alloc] init];
//在新的windon上添加一个控制器LaunchViewController
[self addSubview:launchVC.view];
}
- 在LaunchViewController.m中
#import "LaunchViewController.h"
#import "UIImageView+WebCache.h"
static CGFloat const animationDuration = 3.0;
@interface LaunchViewController ()
@property (nonatomic, strong) UIImageView *launchImage;
@end
@implementation LaunchViewController
#pragma mark - life cycle
- (void)viewDidLoad{
[super viewDidLoad];
[self.view addSubview:self.launchImage];
// 把开屏广告页置于这个控制器的最上层
[self.view bringSubviewToFront:self.launchImage];
[self.view addSubview:self.imageTitle];
// 获得启动动画图片
[self updateLanunchImage];
}
#pragma mark - private method
- (void)updateLanunchImage{
[HttpTool get:@"http://news-at.zhihu.com/api/4/start-image/1080*1776" params:nil success:^(id json) {
//从接口获取图片转为model赋值给LaunchImage这个类里的img
LaunchImage *lanunchImage = [LaunchImage mj_objectWithKeyValues:json];
SDWebImageManager *manger = [SDWebImageManager sharedManager];
[manger downloadImageWithURL:[NSURL URLWithString:lanunchImage.img] options:0 progress:^(NSInteger receivedSize, NSInteger expectedSize) {
nil;
} completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
self.launchImage.image = image;
[UIView animateWithDuration:animationDuration animations:^{
_launchImage.transform = CGAffineTransformMakeScale(1.2, 1.2);
} completion:^(BOOL finished) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.7 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.view removeFromSuperview];
});
}];
}];
} failure:^(NSError *error) {
}];
}
#pragma mark - getter and setter
- (UIImageView *)launchImage{
if (_launchImage == nil) {
_launchImage = [[UIImageView alloc] initWithFrame:kScreenBounds];
_launchImage.image = [UIImage imageNamed:@"Default"];
}
return _launchImage;
}
