图标的旋转

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#pragma mark - 图标旋转

// 將图标向右旋转180度
- (void)transformWithButton:(UIButton *)btn
{
btn.transform = CGAffineTransformRotate(btn.transform, M_PI * -1);

}

// 恢复原样
- (void)identityWithButton:(UIButton *)btn
{
btn.transform = CGAffineTransformIdentity;
}

/* Even though these might be more useful as long doubles, POSIX requires
    that they be double-precision literals.                                   */
#define M_E         2.71828182845904523536028747135266250   /* e              */
#define M_LOG2E     1.44269504088896340735992468100189214   /* log2(e)        */
#define M_LOG10E    0.434294481903251827651128918916605082 /* log10(e)       */
#define M_LN2       0.693147180559945309417232121458176568 /* loge(2)        */
#define M_LN10      2.30258509299404568401799145468436421   /* loge(10)       */
#define M_PI        3.14159265358979323846264338327950288   /* pi             */
#define M_PI_2      1.57079632679489661923132169163975144   /* pi/2           */
#define M_PI_4      0.785398163397448309615660845819875721 /* pi/4           */
#define M_1_PI      0.318309886183790671537767526745028724 /* 1/pi           */
#define M_2_PI      0.636619772367581343075535053490057448 /* 2/pi           */
#define M_2_SQRTPI 1.12837916709551257389615890312154517   /* 2/sqrt(pi)     */
#define M_SQRT2     1.41421356237309504880168872420969808   /* sqrt(2)        */
#define M_SQRT1_2   0.707106781186547524400844362104849039 /* 1/sqrt(2)      */

#define MAXFLOAT    0x1.fffffep+127f
#endif /* __DARWIN_C_LEVEL >= 199506L */

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