在controller 中加载xib的两种方式 :
第一种:
NSBundle *bundle = [NSBundle mainBundle];
NSArray *objs = [bundle loadNibNamed:@"XibName" owner:nil options:nil];
第二种:
UINib *nib = [UINib nibWithNibName:@"xibName" bundle:nil];
NSArray *objs = [[nib instantiateWithOwner:nil options:nil]
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