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<p>__IPHONE_OS_VERSION_MIN_REQUIRED: 当前app支持的最低版本, 即Deployment Target

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__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 */

define __TVOS_9_0 90000

define __TVOS_9_1 90100

define __TVOS_9_2 90200

define __TVOS_10_0 100000

define __WATCHOS_1_0 10000

define __WATCHOS_2_0 20000

define __WATCHOS_3_0 30000