实现默认选中 UISegmentedControl 的第一项。
实现默认选中 UISegmentedControl 的第一项。

Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise