the behavior of the UICollectionViewFlowLayout is not defined because:

the behavior of the UICollectionViewFlowLayout is not defined because:

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** the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.**

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The relevant UICollectionViewFlowLayout instance is , and it is attached to ; layer = ; contentOffset: {0, 0}; contentSize: {0, 125}> collection view layout: .

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Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

解决方法

• (void)viewDidLoad {
  [super viewDidLoad];
  //UICollectionViewController的属性
  self.automaticallyAdjustsScrollViewInsets = NO;
  }