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Objective-C中的字符串格式化输出

2013-04-12 14:56 330 查看
定义说明
%@Objective-C object, printed as the string returned by descriptionWithLocale: if available, or description otherwise. Also works with CFTypeRef objects, returning the result of the CFCopyDescription function.
%%‘%’ character
%d, %D, %iSigned 32-bit integer (int)
%u, %UUnsigned 32-bit integer (unsigned int)
%hiSigned 16-bit integer (short)
%huUnsigned 16-bit integer (unsigned short)
%qiSigned 64-bit integer (long long)
%quUnsigned 64-bit integer (unsigned long long)
%xUnsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and lowercase a–f
%XUnsigned 32-bit integer (unsigned int), printed in hexadecimal using the digits 0–9 and uppercase A–F
%qxUnsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and lowercase a–f
%qXUnsigned 64-bit integer (unsigned long long), printed in hexadecimal using the digits 0–9 and uppercase A–F
%o, %OUnsigned 32-bit integer (unsigned int), printed in octal
%f64-bit floating-point number (double)
%e64-bit floating-point number (double), printed in scientific notation using a lowercase e to introduce the exponent
%E64-bit floating-point number (double), printed in scientific notation using an uppercase E to introduce the exponent
%g64-bit floating-point number (double), printed in the style of %e if the exponent is less than –4 or greater than or equal to the precision, in the style of %f otherwise
%G64-bit floating-point number (double), printed in the style of %E if the exponent is less than –4 or greater than or equal to the precision, in the style of %f otherwise
%c8-bit unsigned character (unsigned char), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal format \\ddd or the Unicode hexadecimal format \\udddd, where d is a digit
%C16-bit Unicode character (unichar), printed by NSLog() as an ASCII character, or, if not an ASCII character, in the octal format \\ddd or the Unicode hexadecimal format \\udddd, where d is a digit
%sNull-terminated array of 8-bit unsigned characters. %s interprets its input in the system encoding rather than, for example, UTF-8.
%SNull-terminated array of 16-bit Unicode characters
%pVoid pointer (void *), printed in hexadecimal with the digits 0–9 and lowercase a–f, with a leading 0x
%LLength modifier specifying that a following a, A, e, E, f, F, g, or G conversion specifier applies to a long double argument
%a64-bit floating-point number (double), printed in scientific notation with a leading 0x and one hexadecimal digit before the decimal point using a lowercase p to introduce the exponent
%A64-bit floating-point number (double), printed in scientific notation with a leading 0X and one hexadecimal digit before the decimal point using a uppercase P to introduce the exponent
%F64-bit floating-point number (double), printed in decimal notation
%zLength modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a size_t or the corresponding signed integer type argument
%tLength modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a ptrdiff_t or the corresponding unsigned integer type argument
%jLength modifier specifying that a following d, i, o, u, x, or X conversion specifier applies to a intmax_t or uintmax_t argument
类型定义建议
NSInteger%ld or %lxCast the value to long
NSUInteger%lu or %lxCast the value to unsigned long
CGFloat%f or %g%f works for floats and doubles when formatting; but see below warning when scanning
CFIndex%ld or %lxThe same as NSInteger
pointer%p%p adds 0x to the beginning of the output. If you don’t want that, use %lx and cast to long.
long long%lld or %llxlong long is 64-bit on both 32- and 64-bit platforms
unsigned long long%llu or %llxunsigned long long is 64-bit on both 32- and 64-bit platforms
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