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<p>__IPHONE_OS_VERSION_MIN_REQUIRED: 当前app支持的最低版本, 即Deployment Target
屏幕快照 2018-11-23 下午5.42.15.png
__IPHONE_OS_VERSION_MIN_REQUIRED：最低iOS版本要求
__IPHONE_OS_VERSION_MAX_ALLOWED：允许最大的iOS版本
define __IPHONE_2_0 20000
define __IPHONE_2_1 20100
define __IPHONE_2_2 20200
define __IPHONE_3_0 30000
define __IPHONE_3_1 30100
define __IPHONE_3_2 30200
define __IPHONE_4_0 40000
define __IPHONE_4_1 40100
define __IPHONE_4_2 40200
define __IPHONE_4_3 40300
define __IPHONE_5_0 50000
define __IPHONE_5_1 50100
define __IPHONE_6_0 60000
define __IPHONE_6_1 60100
define __IPHONE_7_0 70000
define __IPHONE_7_1 70100
define __IPHONE_8_0 80000
define __IPHONE_8_1 80100
define __IPHONE_8_2 80200
define __IPHONE_8_3 80300
define __IPHONE_8_4 80400
define __IPHONE_9_0 90000
define __IPHONE_9_1 90100
define __IPHONE_9_2 90200
define __IPHONE_9_3 90300
define __IPHONE_10_0 100000
/* __IPHONE_NA is not defined to a value but is uses as a token by macros to indicate that the API is unavailable */
