+(NSString *)getScreenPix{
NSString *screenPix = @"";
//屏幕尺寸
CGRect rect = [[UIScreen mainScreen] bounds];
CGSize size = rect.size;
CGFloat width = size.width;
CGFloat height = size.height;
//分辨率
CGFloat scale_screen = [UIScreen mainScreen].scale;
screenPix = [NSString stringWithFormat:@"%.0fx%.0f",width*scale_screen,height*scale_screen];
return screenPix;
}
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