我正在使用Xcode 5的资源目录,我希望将我的 LaunchImage
用作主视图的背景图像(这是使从“加载”到“已加载”转换看起来平滑的常见做法)。
我想使用资源目录中相同的条目来节省空间,而不必在两个不同的图像集中复制图像。
但是,调用:
UIImage *image = [UIImage imageNamed:@"LaunchImage"]; //returns nil
我正在使用Xcode 5的资源目录,我希望将我的 LaunchImage
用作主视图的背景图像(这是使从“加载”到“已加载”转换看起来平滑的常见做法)。
我想使用资源目录中相同的条目来节省空间,而不必在两个不同的图像集中复制图像。
但是,调用:
UIImage *image = [UIImage imageNamed:@"LaunchImage"]; //returns nil
这是LaunchImage(不包括没有状态栏的iPad图像)的(几乎)完整列表:
- (NSString *)splashImageNameForOrientation:(UIInterfaceOrientation)orientation {
CGSize viewSize = self.view.bounds.size;
NSString* viewOrientation = @"Portrait";
if (UIDeviceOrientationIsLandscape(orientation)) {
viewSize = CGSizeMake(viewSize.height, viewSize.width);
viewOrientation = @"Landscape";
}
NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
for (NSDictionary* dict in imagesDict) {
CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
return dict[@"UILaunchImageName"];
}
return nil;
}
UIInterfaceOrientationIsLandscape()
。 - Almog CLaunchImages是特殊的,实际上并不是设备上的资产目录。如果您使用iFunBox/iExplorer等工具(或者在模拟器、构建目录中查看),则可以看到最终名称,并编写代码来使用它们-例如,对于仅针对iOS7的iPhone项目,这将设置正确的启动图像:
NSString *launchImage;
if ((UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) &&
([UIScreen mainScreen].bounds.size.height > 480.0f)) {
launchImage = @"LaunchImage-700-568h";
} else {
launchImage = @"LaunchImage-700";
}
[self.launchImageView setImage:[UIImage imageNamed:launchImage]];
我把这放到viewDidLoad里了。
这并不是最理想的做法,如果苹果能给我们一个好的API来做这个就太好了。
我的应用目前仅支持 iOS 7 及更高版本。
这是我从资源目录引用启动图像的方式:
NSDictionary *dict = @{@"320x480" : @"LaunchImage-700",
@"320x568" : @"LaunchImage-700-568h",
@"375x667" : @"LaunchImage-800-667h",
@"414x736" : @"LaunchImage-800-Portrait-736h"};
NSString *key = [NSString stringWithFormat:@"%dx%d",
(int)[UIScreen mainScreen].bounds.size.width,
(int)[UIScreen mainScreen].bounds.size.height];
UIImage *launchImage = [UIImage imageNamed:dict[key]];
如果您希望支持较旧版本的iOS,可以添加更多的键值对。
UIScreen.mainScreen.bounds
根据当前界面方向而有所不同。请参阅https://dev59.com/amAf5IYBdhLWcg3w52Pm#24153540。 - Jean Regisser这里是基于Cherpak Evgeny所提供的解决方案而创建的UIImage类别。
UIImage+SplashImage.h:
#import <UIKit/UIKit.h>
/**
* Category on `UIImage` to access the splash image.
**/
@interface UIImage (SplashImage)
/**
* Return the name of the splash image for a given orientation.
* @param orientation The interface orientation.
* @return The name of the splash image.
**/
+ (NSString *)si_splashImageNameForOrientation:(UIInterfaceOrientation)orientation;
/**
* Returns the splash image for a given orientation.
* @param orientation The interface orientation.
* @return The splash image.
**/
+ (UIImage*)si_splashImageForOrientation:(UIInterfaceOrientation)orientation;
@end
UIImage+SplashImage.m:
#import "UIImage+SplashImage.h"
@implementation UIImage (SplashImage)
+ (NSString *)si_splashImageNameForOrientation:(UIInterfaceOrientation)orientation
{
CGSize viewSize = [UIScreen mainScreen].bounds.size;
NSString *viewOrientation = @"Portrait";
if (UIDeviceOrientationIsLandscape(orientation))
{
viewSize = CGSizeMake(viewSize.height, viewSize.width);
viewOrientation = @"Landscape";
}
NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
for (NSDictionary *dict in imagesDict)
{
CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
return dict[@"UILaunchImageName"];
}
return nil;
}
+ (UIImage*)si_splashImageForOrientation:(UIInterfaceOrientation)orientation
{
NSString *imageName = [self si_splashImageNameForOrientation:orientation];
UIImage *image = [UIImage imageNamed:imageName];
return image;
}
@end
@codeman的答案已更新,适用于Swift 1.2:
func splashImageForOrientation(orientation: UIInterfaceOrientation, size: CGSize) -> String? {
var viewSize = size
var viewOrientation = "Portrait"
if UIInterfaceOrientationIsLandscape(orientation) {
viewSize = CGSizeMake(size.height, size.width)
viewOrientation = "Landscape"
}
if let imagesDict = NSBundle.mainBundle().infoDictionary as? [String: AnyObject] {
if let imagesArray = imagesDict["UILaunchImages"] as? [[String: String]] {
for dict in imagesArray {
if let sizeString = dict["UILaunchImageSize"], let imageOrientation = dict["UILaunchImageOrientation"] {
let imageSize = CGSizeFromString(sizeString)
if CGSizeEqualToSize(imageSize, viewSize) && viewOrientation == imageOrientation {
if let imageName = dict["UILaunchImageName"] {
return imageName
}
}
}
}
}
}
return nil
}
为了支持 iOS 8 的旋转,需要调用它:
override func viewWillAppear(animated: Bool) {
if let img = splashImageForOrientation(UIApplication.sharedApplication().statusBarOrientation, size: self.view.bounds.size) {
backgroundImage.image = UIImage(named: img)
}
}
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
let orientation = size.height > size.width ? UIInterfaceOrientation.Portrait : UIInterfaceOrientation.LandscapeLeft
if let img = splashImageForOrientation(orientation, size: size) {
backgroundImage.image = UIImage(named: img)
}
}
< p >我正需要这个,谢谢!< /p >
我刚写了一个通用方法来获取iPhone和iPad(横屏、竖屏)的启动图像的名称,对于我来说它是有效的,希望它也能帮到你。我在其他SO答案的帮助下编写了这个方法,感谢@Pichirichi提供的整个列表。
+(NSString*)getLaunchImageName
{
NSArray* images= @[@"LaunchImage.png", @"LaunchImage@2x.png",@"LaunchImage-700@2x.png",@"LaunchImage-568h@2x.png",@"LaunchImage-700-568h@2x.png",@"LaunchImage-700-Portrait@2x~ipad.png",@"LaunchImage-Portrait@2x~ipad.png",@"LaunchImage-700-Portrait~ipad.png",@"LaunchImage-Portrait~ipad.png",@"LaunchImage-Landscape@2x~ipad.png",@"LaunchImage-700-Landscape@2x~ipad.png",@"LaunchImage-Landscape~ipad.png",@"LaunchImage-700-Landscape~ipad.png"];
UIImage *splashImage;
if ([self isDeviceiPhone])
{
if ([self isDeviceiPhone4] && [self isDeviceRetina])
{
splashImage = [UIImage imageNamed:images[1]];
if (splashImage.size.width!=0)
return images[1];
else
return images[2];
}
else if ([self isDeviceiPhone5])
{
splashImage = [UIImage imageNamed:images[1]];
if (splashImage.size.width!=0)
return images[3];
else
return images[4];
}
else
return images[0]; //Non-retina iPhone
}
else if ([[UIDevice currentDevice] orientation]==UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown)//iPad Portrait
{
if ([self isDeviceRetina])
{
splashImage = [UIImage imageNamed:images[5]];
if (splashImage.size.width!=0)
return images[5];
else
return images[6];
}
else
{
splashImage = [UIImage imageNamed:images[7]];
if (splashImage.size.width!=0)
return images[7];
else
return images[8];
}
}
else
{
if ([self isDeviceRetina])
{
splashImage = [UIImage imageNamed:images[9]];
if (splashImage.size.width!=0)
return images[9];
else
return images[10];
}
else
{
splashImage = [UIImage imageNamed:images[11]];
if (splashImage.size.width!=0)
return images[11];
else
return images[12];
}
}
}
其他实用方法包括
+(BOOL)isDeviceiPhone
{
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
return TRUE;
}
return FALSE;
}
+(BOOL)isDeviceiPhone4
{
if ([[UIScreen mainScreen] bounds].size.height==480)
return TRUE;
return FALSE;
}
+(BOOL)isDeviceRetina
{
if ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)] &&
([UIScreen mainScreen].scale == 2.0)) // Retina display
{
return TRUE;
}
else // non-Retina display
{
return FALSE;
}
}
+(BOOL)isDeviceiPhone5
{
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone && [[UIScreen mainScreen] bounds].size.height>480)
{
return TRUE;
}
return FALSE;
}
[screen.coordinateSpace convertRect:screen.bounds toCoordinateSpace:screen.fixedCoordinateSpace]
,但一定要先测试是否在iOS 8上运行,否则可能会导致崩溃。 - Mohamed Hafez以下是Cherpak Evgeny的回答的Swift版本:
func splashImageForOrientation(orientation: UIInterfaceOrientation) -> String {
var viewSize = self.view.bounds.size
var viewOrientation = "Portrait"
if UIInterfaceOrientationIsLandscape(orientation) {
viewSize = CGSizeMake(viewSize.height, viewSize.width)
viewOrientation = "Landscape"
}
let imagesDict = NSBundle.mainBundle().infoDictionary as Dictionary<NSObject,AnyObject>!
let imagesArray = imagesDict["UILaunchImages"] as NSArray
for dict in imagesArray {
let dictNSDict = dict as NSDictionary
let imageSize = CGSizeFromString(dictNSDict["UILaunchImageSize"] as String)
if CGSizeEqualToSize(imageSize, viewSize) && viewOrientation == (dictNSDict["UILaunchImageOrientation"] as String) {
return dictNSDict["UILaunchImageName"] as String
}
}
return ""
}
根据@Pichirich的答案,我在InterfaceBuilder中引用我的启动图像:
"LaunchImage.png"
... 使用Xcode 5.0.2,它会自动从资源目录中直接获取适当的图像。
这是我所期望的 - 除了苹果恶意地将 "Default.png" 静默重命名为 "LaunchImage.png" :)
nil
。 - Alexander Kostiev通过一行代码,您可以轻松访问启动画面。
UIImage *myAppsLaunchImage = [UIImage launchImage];
UIImage
类,然后添加以下方法。+ (UIImage *)launchImage {
NSDictionary *dOfLaunchImage = [NSDictionary dictionaryWithObjectsAndKeys:
@"LaunchImage-568h@2x.png",@"568,320,2,8,p", // ios 8 - iphone 5 - portrait
@"LaunchImage-568h@2x.png",@"568,320,2,8,l", // ios 8 - iphone 5 - landscape
@"LaunchImage-700-568h@2x.png",@"568,320,2,7,p", // ios 7 - iphone 5 - portrait
@"LaunchImage-700-568h@2x.png",@"568,320,2,7,l", // ios 7 - iphone 5 - landscape
@"LaunchImage-700-Landscape@2x~ipad.png",@"1024,768,2,7,l", // ios 7 - ipad retina - landscape
@"LaunchImage-700-Landscape~ipad.png",@"1024,768,1,7,l", // ios 7 - ipad regular - landscape
@"LaunchImage-700-Portrait@2x~ipad.png",@"1024,768,2,7,p", // ios 7 - ipad retina - portrait
@"LaunchImage-700-Portrait~ipad.png",@"1024,768,1,7,p", // ios 7 - ipad regular - portrait
@"LaunchImage-700@2x.png",@"480,320,2,7,p", // ios 7 - iphone 4/4s retina - portrait
@"LaunchImage-700@2x.png",@"480,320,2,7,l", // ios 7 - iphone 4/4s retina - landscape
@"LaunchImage-Landscape@2x~ipad.png",@"1024,768,2,8,l", // ios 8 - ipad retina - landscape
@"LaunchImage-Landscape~ipad.png",@"1024,768,1,8,l", // ios 8 - ipad regular - landscape
@"LaunchImage-Portrait@2x~ipad.png",@"1024,768,2,8,p", // ios 8 - ipad retina - portrait
@"LaunchImage-Portrait~ipad.png",@"1024,768,1,8,l", // ios 8 - ipad regular - portrait
@"LaunchImage.png",@"480,320,1,7,p", // ios 6 - iphone 3g/3gs - portrait
@"LaunchImage.png",@"480,320,1,7,l", // ios 6 - iphone 3g/3gs - landscape
@"LaunchImage@2x.png",@"480,320,2,8,p", // ios 6,7,8 - iphone 4/4s - portrait
@"LaunchImage@2x.png",@"480,320,2,8,l", // ios 6,7,8 - iphone 4/4s - landscape
@"LaunchImage-800-667h@2x.png",@"667,375,2,8,p", // ios 8 - iphone 6 - portrait
@"LaunchImage-800-667h@2x.png",@"667,375,2,8,l", // ios 8 - iphone 6 - landscape
@"LaunchImage-800-Portrait-736h@3x.png",@"736,414,3,8,p", // ios 8 - iphone 6 plus - portrait
@"LaunchImage-800-Landscape-736h@3x.png",@"736,414,3,8,l", // ios 8 - iphone 6 plus - landscape
nil];
NSInteger width = ([UIScreen mainScreen].bounds.size.width>[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.width:[UIScreen mainScreen].bounds.size.height;
NSInteger height = ([UIScreen mainScreen].bounds.size.width>[UIScreen mainScreen].bounds.size.height)?[UIScreen mainScreen].bounds.size.height:[UIScreen mainScreen].bounds.size.width;
NSInteger os = [[[[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."] objectAtIndex:0] integerValue];
NSString *strOrientation = UIDeviceOrientationIsLandscape([[UIDevice currentDevice] orientation])?@"l":@"p";
NSString *strImageName = [NSString stringWithFormat:@"%li,%li,%li,%li,%@",width,height,(NSInteger)[UIScreen mainScreen].scale,os,strOrientation];
UIImage *imageToReturn = [UIImage imageNamed:[dOfLaunchImage valueForKey:strImageName]];
if([strOrientation isEqualToString:@"l"] && [strImageName rangeOfString:@"Landscape"].length==0) {
imageToReturn = [UIImage rotate:imageToReturn orientation:UIImageOrientationRight];
}
return imageToReturn;
}
步骤 2. 在同一类别的 UIImage
中添加以下代码,应该也能起作用。
static inline double radians (double degrees) {return degrees * M_PI/180;}
+ (UIImage *)rotate:(UIImage*)src orientation:(UIImageOrientation) orientation {
UIGraphicsBeginImageContext(src.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orientation == UIImageOrientationRight) {
CGContextRotateCTM (context, radians(90));
} else if (orientation == UIImageOrientationLeft) {
CGContextRotateCTM (context, radians(-90));
} else if (orientation == UIImageOrientationDown) {
// NOTHING
} else if (orientation == UIImageOrientationUp) {
CGContextRotateCTM (context, radians(90));
}
[src drawAtPoint:CGPointMake(0, 0)];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
ipad.png、LaunchImage-Portrait@2xipad.png、LaunchImage-Landscapeipad.png 和 LaunchImage-Landscape@2xipad.png。 - John Jacecko