转：http://b2cloud.com.au/how-to-guides/bar-color-calculator-for-ios7-and-ios8/
计算：http://htmlpreview.github.io/?https://github.com/tparry/Miscellaneous/blob/master/UINavigationBar_UIColor_calculator.html
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转：http://b2cloud.com.au/how-to-guides/bar-color-calculator-for-ios7-and-ios8/
计算：http://htmlpreview.github.io/?https://github.com/tparry/Miscellaneous/blob/master/UINavigationBar_UIColor_calculator.html