验证码UIButton状态UIButtonTypeSystem时候一闪闪UIButtonTypeCustom不闪

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修改UIButton状态，注释NSLog(@"text1：%@",_btn.titleLabel.text);这段结果很不可思议

_btn.titleLabel.text = [NSString stringWithFormat:@"aaaaaa%i",i];

NSLog(@"text1：%@",_btn.titleLabel.text);

NSLog(@"text3：%@",[_btn titleForState:UIControlStateNormal]);

UIButtonTypeSystem

2015-05-21 11:16:10.363 test[6137:504267] text1：aaaaaa4

2015-05-21 11:16:10.363 test[6137:504267] text3：Button111

2015-05-21 11:16:13.368 test[6137:504267] text1：aaaaaa5

2015-05-21 11:16:13.368 test[6137:504267] text3：Button111

UIButtonTypeCustom

2015-05-21 11:17:48.471 test[6260:520944] text1：Button111

2015-05-21 11:17:48.472 test[6260:520944] text3：Button111

2015-05-21 11:17:51.475 test[6260:520944] text1：Button111

2015-05-21 11:17:51.476 test[6260:520944] text3：Button111

UIButtonTypeSystem下面就不闪了，断点情况下会出现原始值

[[_btn class] setAnimationsEnabled:NO];

_btn.titleLabel.text = [NSString stringWithFormat:@"aaaaaa%i",i];

[[_btn class] setAnimationsEnabled:YES];

个人小结论：在引用titleLabel.text的时候 其实会对本身进行一次赋值，默认本身状态下所对应的title值

验证码UIButton状态UIButtonTypeSystem时候一闪闪UIButtonTypeCustom不闪

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原文地址：http://www.cnblogs.com/Leetvin/p/4519904.html