ios中屏幕尺寸的問題

ios屏幕尺寸單位是pt，另一個與屏幕相關的參數是屏幕縮放因子(scale factor)。普通屏幕的縮放因子爲1，retina爲綻放因子爲2。

    CGRect rect1 = self.window.bounds;    
    
    NSLog(@"寬：%f",rect1.size.width);
    NSLog(@"高：%f",rect1.size.height);

    //返回系統版本和縮放因子
    NSLog(@"system version: %@", [[UIDevice currentDevice] systemVersion]);
    NSLog(@"scale factor: %.1f ", [[UIScreen mainScreen] scale]);

 普通的實際像素尺寸爲：size*縮放因子

2014-03-26 08:24:08.579 UIScreenScale[960:70b] 寬：768.000000
2014-03-26 08:24:08.579 UIScreenScale[960:70b] 高：1024.000000
2014-03-26 08:24:08.579 UIScreenScale[960:70b] system version: 7.0.3
2014-03-26 08:24:08.580 UIScreenScale[960:70b] scale factor: 1.0
如：上面是ipad非retina的尺寸爲1024x768