+ (BOOL)isRetina{
if ([[UIDevice currentDevice].systemVersion floatValue]>=8.0) {
return [UIScreen mainScreen].nativeScale>=2;
} else {
return [UIScreen mainScreen].scale>=2;
}
}
+ (float)scale{
if ([[UIDevice currentDevice].systemVersion floatValue]>=8.0) {
return [UIScreen mainScreen].nativeScale;
} else {
return [UIScreen mainScreen].scale;
}
}