typedef NS_ENUM(NSInteger, NSLineBreakMode) { /* What to do with long lines */
NSLineBreakByWordWrapping = 0, /* Wrap at word boundaries, default */
NSLineBreakByCharWrapping, /* Wrap at character boundaries */
NSLineBreakByClipping, /* Simply clip */
NSLineBreakByTruncatingHead, /* Truncate at head of line: "...wxyz" */
NSLineBreakByTruncatingTail, /* Truncate at tail of line: "abcd..." */
NSLineBreakByTruncatingMiddle /* Truncate middle of line: "ab...yz" */
} NS_ENUM_AVAILABLE_IOS(6_0);
其实就是这几个枚举的应用，我只选择了NSLineBreakByCharWrapping这个就可以左对齐了
ios uilable折行后文字怎么都是左对齐
原文：http://blog.csdn.net/rainshenji/article/details/43346991
