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UISegmentedControl error on iOS 4.x

 1 year ago
source link: https://fann.im/blog/2012/07/18/uisegmentedcontrol-error-on-ios-4-dot-x/
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UISegmentedControl error on iOS 4.x

Jul 18, 2012

Code 1:

self.segmentedControl = [[[UISegmentedControl alloc] init] autorelease];
[_segmentedControl setSelectedSegmentIndex:0];
[_segmentedControl addTarget:self
                      action:@selector(segmentedControlSwitch)
            forControlEvents:UIControlEventValueChanged];

Code 2:

self.segmentedControl = [[[UISegmentedControl alloc] init] autorelease];
[_segmentedControl addTarget:self
                      action:@selector(segmentedControlSwitch)
            forControlEvents:UIControlEventValueChanged];
[_segmentedControl setSelectedSegmentIndex:0];

注意 [_segmentedControl setSelectedSegmentIndex:0]; 的位置，在 iOS 4.x 下，Code 2 代码在设置 selectedSegmentIndex 的时候会执行一次 segmentedControlSwitch 方法。在 iOS 5+ 没有这个问题。

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