如何指定iPhone 6/7自定义边到边图像的尺寸？

假设我想要一个捆绑图像占据 iPhone 应用程序中所有可用的屏幕宽度 - 例如横幅。我会创建my_banner.png与宽度320px, [email protected] /cdn-cgi/l/email-protection与宽度640px and [email protected] /cdn-cgi/l/email-protection for iPhone 6 加与宽度1242px。但决议iPhone 6 is 750×1334像素。仍然它共享@2xiPhone 4 和 5 的后缀640px width.

什么是推荐方式 or a good way指定已优化的图像文件750px宽度iPhone 6？似乎无法在短时间内完成asset catalog？应该以编程方式完成吗？是否还有其他后缀可以用于iPhone 6?

(Image extracted from http://www.iphoneresolution.com http://www.iphoneresolution.com)

在我看来，很多答案都想解决如何约束 imageView，我认为您关心的是加载正确的媒体文件？我会提出自己的未来可扩展解决方案，如下所示：

“UIImage+DeviceSpecificMedia.h”-（UIImage 上的类别）

界面：

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, thisDeviceClass) {

    thisDeviceClass_iPhone,
    thisDeviceClass_iPhoneRetina,
    thisDeviceClass_iPhone5,
    thisDeviceClass_iPhone6,
    thisDeviceClass_iPhone6plus,

    // we can add new devices when we become aware of them

    thisDeviceClass_iPad,
    thisDeviceClass_iPadRetina,


    thisDeviceClass_unknown
};

thisDeviceClass currentDeviceClass();

@interface UIImage (DeviceSpecificMedia)

+ (instancetype )imageForDeviceWithName:(NSString *)fileName;

@end

执行：

#import "UIImage+DeviceSpecificMedia.h"

thisDeviceClass currentDeviceClass() {

    CGFloat greaterPixelDimension = (CGFloat) fmaxf(((float)[[UIScreen mainScreen]bounds].size.height),
                                                    ((float)[[UIScreen mainScreen]bounds].size.width));

    switch ((NSInteger)greaterPixelDimension) {
        case 480:
            return (( [[UIScreen mainScreen]scale] > 1.0) ? thisDeviceClass_iPhoneRetina : thisDeviceClass_iPhone );
            break;
        case 568:
            return thisDeviceClass_iPhone5;
            break;
        case 667:
            return thisDeviceClass_iPhone6;
            break;
        case 736:
            return thisDeviceClass_iPhone6plus;
            break;
        case 1024:
            return (( [[UIScreen mainScreen]scale] > 1.0) ? thisDeviceClass_iPadRetina : thisDeviceClass_iPad );
            break;
        default:
            return thisDeviceClass_unknown;
            break;
    }
}

@implementation UIImage (deviceSpecificMedia)

+ (NSString *)magicSuffixForDevice
{
    switch (currentDeviceClass()) {
        case thisDeviceClass_iPhone:
            return @"";
            break;
        case thisDeviceClass_iPhoneRetina:
            return @"@2x";
            break;
        case thisDeviceClass_iPhone5:
            return @"-568h@2x";
            break;
        case thisDeviceClass_iPhone6:
            return @"-667h@2x"; //or some other arbitrary string..
            break;
        case thisDeviceClass_iPhone6plus:
            return @"-736h@3x";
            break;

        case thisDeviceClass_iPad:
            return @"~ipad";
            break;
        case thisDeviceClass_iPadRetina:
            return @"~ipad@2x";
            break;

        case thisDeviceClass_unknown:
        default:
            return @"";
            break;
    }
}

+ (instancetype )imageForDeviceWithName:(NSString *)fileName
{
    UIImage *result = nil;
    NSString *nameWithSuffix = [fileName stringByAppendingString:[UIImage magicSuffixForDevice]];

    result = [UIImage imageNamed:nameWithSuffix];
    if (!result) {
        result = [UIImage imageNamed:fileName];
    }
    return result;
}

@end