Retina (3.5/4 inch Screen) or Non-Retina 比量

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {    if ([[UIScreen mainScreen] scale] == 2.0) {       if([UIScreen mainScreen].bounds.size.height == 568){          // iPhone retina-4 inch        } else{         // iPhone retina-3.5 inch        }}else {    // not retina display}

iOS6/iOS7 推断

NSString *ver = [[UIDevice currentDevice] systemVersion]; float ver_float = [ver floatValue]; if (ver_float >= 7.0) {    //iOS >=7 } else{    //iOS <7  }

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