This is because the types of NSInteger are different under 32-bit and 64-bit platforms. NSInteger is int type under 32-bit platform and long type under 64-bit platform. If you select the 32-bit platform when compiling, (iPhone4, iPhone4s, iPhone5) then this warning will be reported, but if you choose a 64-bit platform (iPhone5s and above), then this warning will not be reported
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This is because the types of NSInteger are different under 32-bit and 64-bit platforms. NSInteger is int type under 32-bit platform and long type under 64-bit platform. If you select the 32-bit platform when compiling, (iPhone4, iPhone4s, iPhone5) then this warning will be reported, but if you choose a 64-bit platform (iPhone5s and above), then this warning will not be reported
Use
%zd，NSUinteger用%zu,保证是正整数也可以使用%zi