[[UIScreen mainScreen] bounds]和 applicationFrame
一直对ios设备的尺寸不大敏感，搞不清[[UIScreen mainScreen] bounds] 和[UIScreen mainScreen] applicationFrame]的区别，故总是心虚，现扫盲下：
定义一个宏：
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#define PrintRect(frame) NSLog(@"X:%f,Y:%f,W:%f,H:%f",frame.origin.x,frame.origin.y,frame.size.width,frame.size.height)
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测试调用：
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NSLog(@
"[[UIScreen mainScreen] bounds]"
);
PrintRect([[UIScreen mainScreen] bounds]);
NSLog(@
"[[UIScreen mainScreen] applicationFrame]"
);
PrintRect([[UIScreen mainScreen]applicationFrame]);
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测试结果：
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//Ipad4
retain:
2013-07-17 10:08:39.094 IpadSize[191:907] [[UIScreen mainScreen] bounds]
2013-07-17 10:08:39.097 IpadSize[191:907] X:0.000000,Y:0.000000,W:768.000000,H:1024.000000
2013-07-17 10:08:39.098 IpadSize[191:907] [[UIScreen mainScreen] applicationFrame]
2013-07-17 10:08:39.099 IpadSize[191:907] X:0.000000,Y:20.000000,W:768.000000,H:1004.000000
//ipad
normal:
2013-07-17 10:19:09.886 IpadSize[1223:11303] [[UIScreen mainScreen] bounds]
2013-07-17 10:19:09.887 IpadSize[1223:11303] X:0.000000,Y:0.000000,W:768.000000,H:1024.000000
2013-07-17 10:19:09.887 IpadSize[1223:11303] [[UIScreen mainScreen] applicationFrame]
2013-07-17 10:19:09.888 IpadSize[1223:11303] X:0.000000,Y:20.000000,W:768.000000,H:1004.000000
//iphone
:
2013-07-17 10:15:39.372 IpadSize[1005:11303] [[UIScreen mainScreen] bounds]
2013-07-17 10:15:39.373 IpadSize[1005:11303] X:0.000000,Y:0.000000,W:320.000000,H:480.000000
2013-07-17 10:15:39.374 IpadSize[1005:11303] [[UIScreen mainScreen] applicationFrame]
2013-07-17 10:15:39.374 IpadSize[1005:11303] X:0.000000,Y:20.000000,W:320.000000,H:460.000000
//iphone
3.5 retain:
2013-07-17 10:16:34.145 IpadSize[1043:11303] [[UIScreen mainScreen] bounds]
2013-07-17 10:16:34.146 IpadSize[1043:11303] X:0.000000,Y:0.000000,W:320.000000,H:480.000000
2013-07-17 10:16:34.147 IpadSize[1043:11303] [[UIScreen mainScreen] applicationFrame]
2013-07-17 10:16:34.147 IpadSize[1043:11303] X:0.000000,Y:20.000000,W:320.000000,H:460.000000
//iphone
4 retain:
2013-07-17 10:17:26.562 IpadSize[1083:11303] [[UIScreen mainScreen] bounds]
2013-07-17 10:17:26.563 IpadSize[1083:11303] X:0.000000,Y:0.000000,W:320.000000,H:568.000000
2013-07-17 10:17:26.564 IpadSize[1083:11303] [[UIScreen mainScreen] applicationFrame]
2013-07-17 10:17:26.564 IpadSize[1083:11303] X:0.000000,Y:20.000000,W:320.000000,H:548.000000
//IPHONE
6 Plus:
2015-01-09 19:59:57.905 TripPlusMeIphone[1183:230595] [[UIScreen mainScreen] bounds]
2015-01-09 19:59:57.905 TripPlusMeIphone[1183:230595] X:0.000000,Y:0.000000,W:414.000000,H:736.000000
2015-01-09 19:59:57.905 TripPlusMeIphone[1183:230595] [[UIScreen mainScreen] applicationFrame]
2015-01-09 19:59:57.905 TripPlusMeIphone[1183:230595] X:0.000000,Y:0.000000,W:414.000000,H:736.000000
//iphone
6
2015-01-09 20:02:32.910 TripPlusMeIphone[87512:1855595] [[UIScreen mainScreen] bounds]
2015-01-09 20:02:32.911 TripPlusMeIphone[87512:1855595] X:0.000000,Y:0.000000,W:375.000000,H:667.000000
2015-01-09 20:02:32.911 TripPlusMeIphone[87512:1855595] [[UIScreen mainScreen] applicationFrame]
2015-01-09 20:02:32.911 TripPlusMeIphone[87512:1855595] X:0.000000,Y:0.000000,W:375.000000,H:667.000000
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从日志输出可以看到，bounds就是屏幕的全部区域，applicationFrame就是app显示的区域，不包含状态栏（高度20，如果状态栏隐藏的话，那么，这个结果就和bounds一样了）